Hi Flow Cats Installed Video

[lmcgrew79]

Got the Randon Tech Metallica High Flow Cats Today. Install was about as easy as the gen4 worst part was getting the factory exhaust clamp over the end of the cat, other than that a breeze. Sounds alot deeper at idle and when revved kinda stock like but a good bit louder. Sounds really good once i get the sills bolted back ill take it for a test drive. Idle sound on the video is pretty accurate the revving i think is buffered by the iphone.


https://www.youtube.com/watch?v=xUrPjVe34Bo

[Steve M]

Man...that sounds really nice with the stock mufflers. I definitely want to do this in the near future for my Gen 4...did you get them from Jon B?

[BJG32]

Man...that sounds really nice with the stock mufflers. I definitely want to do this in the near future for my Gen 4...did you get them from Jon B?

JonB is the only person who sells them for Gen5. He can get you Gen 4 too.

[Steve M]

JonB is the only person who sells them for Gen5. He can get you Gen 4 too.

He's who I'm planning on going through...I'll just need them slightly modded to meet my needs.

[Vipes]

Sounds nice!

[09 ACR]

This sounds great ordered a set today.

[Crotalidae]

Had these on Gen I & loved them...car sounds great!!! Can we order these directly from Random Tech???

[lmcgrew79]

Ok finally got to drive the car. Gained around 8 rwhp on average. Love it with the factory mufflers. Its louder at idle/startup, no drone, not much different than stock just cruising around, and very loud at WOT! :icon_devil:





https://www.youtube.com/watch?v=YutihrcBL7I

[vegasgtr]

only 8 hp? damn thought for sure it would be more. what were the final numbers?

[lmcgrew79]

only 8 hp? damn thought for sure it would be more. what were the final numbers?

538/482 8 hp at peak 17 hp thru the the mid range. This dyno has always read a low, its a very good gm tuners in ky. For reference a zr1/c7z puts down around 515-520 on it.

[vegasgtr]

538/482 8 hp at peak 17 hp thru the the mid range. This dyno has always read a low, its a very good gm tuners in ky. For reference a zr1/c7z puts down around 515-520 on it.

17 is solid in the middle. Mine is in transit. Tracking shows Thursday.

so you just have the Hi-Flow and tune?

[Steve M]

only 8 hp? damn thought for sure it would be more. what were the final numbers?

Considering the Gen 5 cats are higher flowing than the Gen 4 cats, I'd say this is pretty damn good actually.

[vegasgtr]

Considering the Gen 5 cats are higher flowing than the Gen 4 cats, I'd say this is pretty damn good actually.

The figure in the middle (17WHP) is what i was looking for. Remember Gen V has 4 cats. getting rid of 2 and adding super hi flow should help.

Any weight saving?

[G37Sam]

I thought HFC's replace all 4?

[lmcgrew79]

17 is solid in the middle. Mine is in transit. Tracking shows Thursday.

so you just have the Hi-Flow and tune? Yes


The figure in the middle (17WHP) is what i was looking for. Remember Gen V has 4 cats. getting rid of 2 and adding super hi flow should help.

Any weight saving? Yes but i was to involved to weight them I would say around half as light as the stock ones


I thought HFC's replace all 4? It does, there are 2 cats in each pipe.

[timberwolf]

I wonder what the gains are vs high flow catted headers

[vegasgtr]

I wonder what the gains are vs high flow catted headers

I bet not a lot from 17whp in the middle. Maybe another 5

[timberwolf]

I bet not a lot from 17whp in the middle. Maybe another 5
I guess if you bolt on a supercharger or do a heads cam package, that's where the headers start to help with flow. If you're staying with basic bolt ons, this looks like a nice way to get heat out, get better sound and free up some power! Cool stuff.

[Voice of Reason]

Now the next question should be.....is this going to cook O2 wires like the headers w high flow cats are? If the answer is no then IMO this is a much safer way to gain a little power and reduce the chance of melting something.

[vegasgtr]

Now the next question should be.....is this going to cook O2 wires like the headers w high flow cats are? If the answer is no then IMO this is a much safer way to gain a little power and reduce the chance of melting something.

I would say no.. based off the fact that headers have pipes going out and different direction (if you will) vs these that are the same path just missing the 2 big cats and high flowing narrower cats. Headers have an unorthodox flow of pipes coming of the manifold. Now this is just my opinion.

[timberwolf]

Ok finally got to drive the car. Gained around 8 rwhp on average. Love it with the factory mufflers. Its louder at idle/startup, no drone, not much different than stock just cruising around, and very loud at WOT! :icon_devil:





https://www.youtube.com/watch?v=YutihrcBL7I

Any noticeable temperature drop? I'm looking to get some heat out as it cooks my paint.

[vegasgtr]

just got it installed. Loud as hell on WOT. normal driving its fine. Had the pipes wrapped and the yellow section of my car wrapped. I only drove it for 10 min..

It has that new pipe smell (burning) , should clear up in a few days?

[rsmitchell10]

Do these have any impact on OBD II emissions test? Would like to do a swap on my 2015 but don't want to have an issue with GA testing.

[Dman]

Considering headers with hiflows are ok for O2 and emissions, I wouldn't think just the cat swap would be a problem. Headers you're looking at another 30whp.

[SRT BILL]

Vegasgtr, What exactly did you have installed? did you do the install yourself or have a shop do it. Also could you please post some additional results, likes and dislikes. And how about the temp of the sills..
Thanks, Bill

[timberwolf]

Vegasgtr, What exactly did you have installed? did you do the install yourself or have a shop do it. Also could you please post some additional results, likes and dislikes. And how about the temp of the sills..
Thanks, Bill

And how is drone at cruising speed? I'm really not looking to add to the drone factor personally, but would love to lower sill temperature like Bill mentioned

[lmcgrew79]

No drone, the sills are still hot after driving for awhile, not sure they are as hot but def still hot.

[vegasgtr]

Vegasgtr, What exactly did you have installed? did you do the install yourself or have a shop do it. Also could you please post some additional results, likes and dislikes. And how about the temp of the sills..
Thanks, Bill

I am going to the gym in a few hours and run some errands. so I will let you know. I had the high flow single cat from joB installed and i also have the cross exhaust.

I can tell you its very loud WOT. but not bad at idle and normal driving.

[timberwolf]

No drone, the sills are still hot after driving for awhile, not sure they are as hot but def still hot.
Great info! Is drone same as stock or less?


I am going to the gym in a few hours and run some errands. so I will let you know. I had the high flow single cat from joB installed and i also have the cross exhaust.

I can tell you its very loud WOT. but not bad at idle and normal driving.
What is the cross exhaust? Def share your data when you come back!

[darbgnik]

What is the cross exhaust? Def share your data when you come back!

Corsa autocorrected?

[Dman]

Great info! Is drone same as stock or less?


What is the cross exhaust? Def share your data when you come back!

I bet auto-correct turned Corsa into cross. lol

[vegasgtr]

Sorry, Its Corsa.

I just got through driving it for 1 hour around town with a few WOT pulls.Temps outside were 93*. Car is pretty tame under normal driving. WOT extra loud. The temps by the door are definitely cooler! car feels a little more responsive. NO extra drone (same as OEM)

[Rapidrezults]

Sorry, Its Corsa.

I just got through driving it for 1 hour around town with a few WOT pulls.Temps outside were 93*. Car is pretty tame under normal driving. WOT extra loud. The temps by the door are definitely cooler! car feels a little more responsive. NO extra drone (same as OEM)

That is great news. Definitely ordering this combo. Thanks.

[SRT BILL]

Vegasgtr, which one of JonB high flows did you use? I believe he has two versions for the GenV.

[vegasgtr]

So drove the car tonight with windows down ( it was a little cooler ) car is too loud for me. I drive the car more than the average viper owner. I will be putting them up for sale. I am not sure if it's because the corsa exhaust is making it even louder . I might try with stock exhaust and see how that sounds . If that is still too loud . I will go back to 100% stock exhaust .

[darbgnik]

So drove the car tonight with windows down ( it was a little cooler ) car is too loud for me. I drive the car more than the average viper owner. I will be putting them up for sale. I am not sure if it's because the corsa exhaust is making it even louder . I might try with stock exhaust and see how that sounds . If that is still too loud . I will go back to 100% stock exhaust .

I have no experience with it, but I have read that anything(cats, headers) combined with Corsa will be loud. So going back to the stock exhaust should help.

[v10tt]

A friend of mine installed the high flow cats and Corsa cat back, stock exhaust manifolds
I have full belanger with headers and hi flows.
His exhaust is way louder than mine, Corsas have the same stock sound but Louder, Belangers sound much deeper, and have more base.

[timberwolf]

So drove the car tonight with windows down ( it was a little cooler ) car is too loud for me. I drive the car more than the average viper owner. I will be putting them up for sale. I am not sure if it's because the corsa exhaust is making it even louder . I might try with stock exhaust and see how that sounds . If that is still too loud . I will go back to 100% stock exhaust .

I would bet it's the Corsa. If you do a search, and I have on exhaust combos, everyone seems to say the Corsa paired with headers is the loudest combo. I find it strange cause Corsa usually makes milder, drone free exhausts. Anyway, I would eliminate the Corsas and try the stockers with the high flows. I bet that;'s a nice combo

[lmcgrew79]

I had high flows and corsas on my 08 and they was much louder than the highflow/stock combo on the 14.

[Crotalidae]

Looking forward to your impression w/ high flow cats & stock exhaust...I'm on the fence on this one...


So drove the car tonight with windows down ( it was a little cooler ) car is too loud for me. I drive the car more than the average viper owner. I will be putting them up for sale. I am not sure if it's because the corsa exhaust is making it even louder . I might try with stock exhaust and see how that sounds . If that is still too loud . I will go back to 100% stock exhaust .

[vegasgtr]

Looking forward to your impression w/ high flow cats & stock exhaust...I'm on the fence on this one...


Thanks for the advice guys. Heading to shop now. Will put the stock exhaust on and see if that tones it down. If not I will go back to 100% stock.

Ill let you guys know my thoughts!

[BJG32]

Metal substrate is much louder than ceramic. My understanding is it only makes sense to do metal with s/c applications.

I have ceramic on my gen 5 with stock exhaust/manifold and love the sound. It's only loud when you want it to be.

[Dman]

After a lot of back and forth and input from JonB on the loudness of full Belanger and Corsa, I did the Belanger & high flows, with the stock catback and the sound is delicious. I can say though, any louder at all, and I'd not be happy. At WOT it really rips, with windows down, and getting on it, you couldn't take that every day. On track no prob, with a helmet and ear plug it's nothing.

On my gen4 I had the Aero catback just to try something different and any ride more than 30 mins I put a plug in my left ear or afterward I'd have a ringing, it was a deeper more intrusive tone than Corsa and the frequency sounded great but would wear on you. So, I'd think it's the Corsa too, which is a bit different from prev gens, it used to be the perfect catback to get good sound without going deaf. The price of these side exhausts, man, on my gen2 I had full Belanger with straight thru and it was awesome, but rear exit exhaust made it no issue.

[vegasgtr]

so Corsa is off. Sound is quieter. I only drove it for 3 miles and will have to run some errands..Ill drive later tonight.

I agree with Dman , the exhaust is right by your ear and is the only flaw i find with the viper. wish they made it go straight through the back.

[vegasgtr]

so got some seat time. Its definitely quieter but does not have that throaty Corsa sound :(. The Corsa's had a great sound to them with stock cats.

Anyways , if someone wants the crosa exhaust PM me. they have 300miles on them in MINT condition. I can't have both on the car.

[timberwolf]

so got some seat time. Its definitely quieter but does not have that throaty Corsa sound :(. The Corsa's had a great sound to them with stock cats.

Anyways , if someone wants the crosa exhaust PM me. they have 300miles on them in MINT condition. I can't have both on the car.

So it sounded better with just the corsas huh. Man this whole thing is a mess. So it sounded better with just corsa.. Would you go back?

[vegasgtr]

So it sounded better with just the corsas huh. Man this whole thing is a mess. So it sounded better with just corsa.. Would you go back?

with just Corsa's on it sounded the best, deeper sound.

With Corsa's on and JonB's high flow was too loud for my taste.

With JonD high flow and stock , prob more power but less deep.

for now i decided to sell the Corsa's as i am not in a mood to pay them to put the stock mid section back on.

Overall best sound was stock and corsa. If i can't get a 1000$ for the corsa , Ill keep it and prob go back to that setup.

[GTViper]

Finally got the cat-backs from Random Tec. installed-the ceramic ones. My Viper is a stock 2013. I had the dealership install them-$350 per side. My personal impression is if you are not planning on adding headers, this is the perfect sound for a Viper! The drone/noise I would get around 50mph is completely gone and I haven't had it at any other speed or RPM. The sound you hear from a stock exhaust when you first start it up, before the idle drops, that's now the normal idle sound and when you give it some gas, that's when you turn off your stereo and realize the real music is outside your car!
I don't know about any specific power gains but I definitely noticed an increase in torque..Maybe due to the high altitude? (I live in Denver).
I would highly recommend this to anyone looking for a great exhaust sound at a low cost. Thank you Jon B for all your help!!

[SammutRacing]

anyone with the high flow cat set up having a CEL issued? I had CEL issues with the highflows from RT on my gen 4. pain in the butt and really don't want to go down that road again.. I most likely wont be tuning my gen 5 but am dying to do an exhaust and fear the cosa alone is not enough. id love to cut out the secondary useless cats and put a corsa on but I don't know anyone that can cut out the 2nd cats and weld a straight section in here on long island. so anyone have a CEL issue...yet?

[BJG32]

I got a CEL after 300 miles of use. P0420 code (google it). I just installed O2 simulators and hoping it clears the code. Based on my experience if you do High flows I would install and O2 simulator during install. If you already installed High flows, put the car back together, you can still install these later if you get a code. The O2 sensors are accessible from underneath the car. I bought 2 angled ones and they fit perfectly. Just need to drive for a bit to clear the code...

http://bigdaddiesgarage.com/angled-cel-fix.html#Angled O2 Simulator Big Daddies Garage

[SammutRacing]

ahh.. was afraid of this.. probably a waste of time IMO if they throw CEL especially since they advertise NO CEL.. they really shouldn't advertise no CEL, kind of false advertising no? especially when most people I speak with RT cats on gen 4/5 have a CEL issues . I had this issue with my gen 4 and got no ware with the vendor when I told him hey, what about the no CEL claim? with my gen 4 sims did NOT fixed it. big pain in the butt for inspections to swap back and fourth.. please keep me / us posted if the sims work for the gen 5. fingers crossed !

[timberwolf]

Finally got the cat-backs from Random Tec. installed-the ceramic ones. My Viper is a stock 2013. I had the dealership install them-$350 per side. My personal impression is if you are not planning on adding headers, this is the perfect sound for a Viper! The drone/noise I would get around 50mph is completely gone and I haven't had it at any other speed or RPM. The sound you hear from a stock exhaust when you first start it up, before the idle drops, that's now the normal idle sound and when you give it some gas, that's when you turn off your stereo and realize the real music is outside your car!
I don't know about any specific power gains but I definitely noticed an increase in torque..Maybe due to the high altitude? (I live in Denver).
I would highly recommend this to anyone looking for a great exhaust sound at a low cost. Thank you Jon B for all your help!!

Can you share a link to the units you bought?

Thanks! Great news!

[BJG32]

ahh.. was afraid of this.. probably a waste of time IMO if they throw CEL especially since they advertise NO CEL.. they really shouldn't advertise no CEL, kind of false advertising no? especially when most people I speak with RT cats on gen 4/5 have a CEL issues . I had this issue with my gen 4 and got no ware with the vendor when I told him hey, what about the no CEL claim? with my gen 4 sims did NOT fixed it. big pain in the butt for inspections to swap back and fourth.. please keep me / us posted if the sims work for the gen 5. fingers crossed !

I am the first CEL, but also one of the first to install. CEL should not of gone on, but to your point probably shouldn't advertise it as no CEL though. Dick Winkles has even looked into my issue for JonB...his theory was I am not driving aggressive enough?? Nobody is really sure why it went on, but I am working on it and will provide a solution when I have one.

[G37Sam]

Looks like I'm gonna have to install the spark plug non-foulers that I ordered earlier

[SRT BILL]

Hey BJG32 how are you making out with the 02 simulators?? Did they solve the CEL problem?

[G37Sam]

I'm gonna attempt spark plug non-foulers, let's see how that goes.

[timberwolf]

I am the first CEL, but also one of the first to install. CEL should not of gone on, but to your point probably shouldn't advertise it as no CEL though. Dick Winkles has even looked into my issue for JonB...his theory was I am not driving aggressive enough?? Nobody is really sure why it went on, but I am working on it and will provide a solution when I have one.

Do you have the Arrow PCM?

[BJG32]

Do you have the Arrow PCM?

Stock PCM

[BJG32]

Hey BJG32 how are you making out with the 02 simulators?? Did they solve the CEL problem?

I manually reset the CEL and have about 150 miles now with no CEL. I am almost positive the O2 simulators resolved the issue, but need a few more drive cycles before 100% confident. When I hit 400 miles with the simulators I will report back....at that point I'll be pretty confident the issue has been resolved.

[SammutRacing]

thanks! please let us know, I hope it fixed the issue!

[BJG32]

thanks! please let us know, I hope it fixed the issue!

I definitely will....

[mblgjr]

Sounds like someone needs an Arrow Pcm

[SRT BILL]

will the arrow Pcm over ride the Cel?

[rlhay2]

will the arrow Pcm over ride the Cel?

Yes. But it will not pass a plug in OBD-II inspection.

[mblgjr]

Yes. But it will not pass a plug in OBD-II inspection.


But you can pop the Oem pcm back in and should have just long enough to pass inspections.

[Malu59RT]

But you can pop the Oem pcm back in and should have just long enough to pass inspections.

Actually this is not true. Part of the PCM swap procedure is to disconnect the battery, and the car has to be driven for a while after this, to set the readiness codes. I wouldn't risk swapping the PCM's with the battery connected, and frying something.

[SRT BILL]

Malu, are you saying that if the battery is disconnected the swap can take place and all should be good? If so can you then swap back to the Arrow PCM without having to bring veh back to dealer? I've been considering a change to the arrow PCM and high flow Cats and leave the rest of the system stock. From what I've read it seems like the right amount of change for my purpose.

[Malu59RT]

Malu, are you saying that if the battery is disconnected the swap can take place and all should be good? If so can you then swap back to the Arrow PCM without having to bring veh back to dealer? I've been considering a change to the arrow PCM and high flow Cats and leave the rest of the system stock. From what I've read it seems like the right amount of change for my purpose.

The first time you swap the PCM, it has to go to the dealership so the VIN and mileage can be programmed, and also for the throttle learn procedure. Note, the throttle learn procedure may have to be done several times (I've done it 4 times and supposedly it needs to be re-done again).

Once the PCM is married to your car, you can swap whenever you want. I've gotten to the point I can do this in less than 5 minutes.

1.) Disconnect negative battery cable.
2.) Undo 3 bolts that hold PCM to the car.
3.) Unclip the 4 plugs.
4.) Swap PCM.
5.) Secure 4 plugs.
6.) Attach PCM to car.
7.) Re-connect battery.

I have the full instructions at home if you need them, but they come with the PCM.

[SRT BILL]

Malu, thanks for the info. Did you do the original install of the arrow pvm and then drive it to the dealer to do the VIN and odometer update? What other mods do you have on your vehicle?

[Malu59RT]

Malu, thanks for the info. Did you do the original install of the arrow PCM and then drive it to the dealer to do the VIN and odometer update? What other mods do you have on your vehicle?

Car can't be driven with the new PCM, until the VIN is assigned and mileage updated. I didn't mod the car for performance, the PCM was the only way I knew of to remove the skip shift. I've been caught pulling into traffic and locked out of 2nd gear enough times I had to get rid of it, and this is my daily driver. I honestly can't tell any power difference with the PCM, and it dyno'd pretty similar to my stock 08 Viper (566 whp in my 2013 with PCM vs. 560 whp in my stock 08).

[genVer]

Car can't be driven with the new PCM, until the VIN is assigned and mileage updated. I didn't mod the car for performance, the PCM was the only way I knew of to remove the skip shift. I've been caught pulling into traffic and locked out of 2nd gear enough times I had to get rid of it, and this is my daily driver. I honestly can't tell any power difference with the PCM, and it dyno'd pretty similar to my stock 08 Viper (566 whp in my 2013 with PCM vs. 560 whp in my stock 08).

Wow, it's hard to imagine you didn't pick up HP with the Arrow controller. I dyno'd mine the day before and the day after the installation and picked up 40rwhp (dynojet). I knew before I put it on the dyno the second time that it was noticeably stronger.

[Malu59RT]

Wow, it's hard to imagine you didn't pick up HP with the Arrow controller. I dyno'd mine the day before and the day after the installation and picked up 40rwhp (dynojet). I knew before I put it on the dyno the second time that it was noticeably stronger.

I apologize, I don't think that came off the same way I intended regarding the Arrow controller. We know the Gen V's dyno lower because of the 3.55's, so I imagine some power was lost there, and my car just may be a dog from the factory (total HP). I can take my Viper to a local shop, run it 4-5 times and swap the PCM and run it another 4-5 times to see how they compare. Once I get my car back....LOL.

I've probably swapped the PCM about 12 times so far, and I can never tell a difference in power, but that may be because I'm desensitized to it.

[genVer]

Oh gotcha, I see what you mean now. :D

[mblgjr]

There's definitely a power increase starting from 3k onward with the Arrow PCM.

I never intended to swap the PCM with the battery connected; figured that was a given not to be a retard when it comes to electronics.

Anyway, there's no major horsepower to be had swapping to high flow cats vs using the Arrow PCM. So if you're going to play with headers/cats, get an HP Tuners setup or the Arrow FIRST.

[SRT BILL]

[QUOTE=Malu59RT;167009]Car can't be driven with the new PCM, until the VIN is assigned and mileage updated. QUOTE]

So The dealer has to do the PCM install??

[Steve M]

So The dealer has to do the PCM install??

Yes, but only the initial install. After that, the end user can swap back and forth as they see fit.

[BJG32]

thanks! please let us know, I hope it fixed the issue!

Hey Sammut...I made it to 360 miles with no CEL, but my car spun a bearing!!! Obviously the bearing is unrelated to the high flow, but I made it about 30 miles past when the CEL showed up. I am pretty confident it was fixed, but my test will have to be reset after I get my new engine. Probably several weeks before I can start the test over.... Several high flows have been installed and I have yet to see another person report a CEL issue.

[lmcgrew79]

BJG32 Oil starvation or what?

[BJG32]

Dealer is now saying it was only down less than 1 qt of oil. They have yet to tear it apart, but all signs are pointing to the dreaded debris in the engine block issue.

Good news is I get a 2016 engine. 5 more hp...joy.

[7TH_SIGN]

So these throw up CEL even though they are claimed not to? I was about to place my order but not if they throw CEL.

http://www.viperpartsrack.com/viper-exhaust/viper-exhaust-emissions/high-flow-catalytic-converters-srt

[vegasgtr]

So these throw up CEL even though they are claimed not to? I was about to place my order but not if they throw CEL.

http://www.viperpartsrack.com/viper-exhaust/viper-exhaust-emissions/high-flow-catalytic-converters-srt

yes after 500 miles of driving i got the code. I will remove it with the tune.For those that have no tune its annoying seeing the service engine light on.

[BJG32]

yes after 500 miles of driving i got the code. I will remove it with the tune.For those that have no tune its annoying seeing the service engine light on.

Did you make jonb aware of the CEL?

[vegasgtr]

Did you make jonb aware of the CEL?

No, I just went into Hptuners and turned off the code. Not sure he can do anything for me at this point?

[BJG32]

He can't but i was keeping him informed on mine. I think he'll want to know about yours so he knows mine is not just a fluke.

[vegasgtr]

He can't but i was keeping him informed on mine. I think he'll want to know about yours so he knows mine is not just a fluke.

yes send him the link. I got the P0420 CODE.

[BJG32]

Same code here.

[7TH_SIGN]

What about a SCT Tuner to address the CEL. On my GEN II I just plugged it in to the OBDII and disabled it.

[Steve M]

What about a SCT Tuner to address the CEL. On my GEN II I just plugged it in to the OBDII and disabled it.

SCT has never offered a Gen 4/5 tuning solution that would let you do that. They were rumored to be working on it a few years ago, but the product never made it to market.

[BJG32]

What about a SCT Tuner to address the CEL. On my GEN II I just plugged it in to the OBDII and disabled it.

I am attempting to remedy my CEL with 02 simulators. With my recent blown engine issue I won't know if they worked Likely until late November.

[SammutRacing]

dam, sorry about the motor.. im starting to get nervous about mine.. seems for the limited amount of viper owners on this forum, and for the amount of cars produced, there are WAY to many catastrophic engine failures going on. I have vipers mostly for the reliability " bullet proof " factor.. seems that may not be the case anymore. good luck and keep us posted.

and on the CEL topic... to me a CEL light here and there that I can clear quickly with a hand tool / code scanner I don't mind, comes with changing cats/exhaust... I just need it to be able to show systems ready to pass inspection in NY prior to the CEL coming up... my gen 4 would not with RT cats. please all with GEN5 with RT cats (and stock PCM) keep us all posted.

[7TH_SIGN]

I asked Jon at PartsRack about the high flows throwing a CEL, he said they haven't sold many units for the GEN V but only one had seen the CEL come on.

My thing is if I'm going to keep a cat on the car, I don't want a CEL, if that's the case I'll just remove all the cats and run straight pipes with the stock muffler. Yeah yeah I know, loud, smelly, and fire. I don't care. I'm not driving a Lexus.

In regards to the reliability of these GEN V, I think my GEN II was built better.

[sadil]

In the mustang world, I am not aware of a high-flow CAT that avoids causing a CEL. I think its mostly bogus from an engineering point of view. The O2 system is pretty simple. One O2 sensor upstream of the cat, and one downstream. O2 sensor converts 02 ppm to voltage reading between 0-1V or 0-5V depending on if you are using narrow band or wide band sensors. Rear sensor talks to front to compare voltage reading, if there is no change then you get the P0420/P0430 code for CAT efficiency because the car thinks your cat isnt working.

If hydrocarbons in the exhaust are channeled through a path of precious metals in the cat, causing a reaction, to meet emission. I dont understand how a higher-flow cat with less resistance (exhaust air travelling faster) can do the same thing. More efficient precious metals that react faster and require less material and time to produce the same end result? The Viper from the factory would have already had cats that are as least restrictive as possible while still meeting emissions. There would be no reason to hold back power.

[Voice of Reason]

The factory has to worry about the cats working for 8 years/80k miles. It's entirely possible an aftermarket cat is able to scrub the exhaust with the same efficiency as stock...but only last for 4/40. So the manufacturer can't use them.

That being said my Arrow PCM/ARH headers w cats combo does smell a bit in enclosed areas (pulling in/out of my garage). Stock I could not smell anything. Some of that may be tune, but I'm sure it's more cat related.

[G37Sam]

I used spark plug non foulers, around 200 miles so far CEL free. I will report back in a few hundred more miles.

I'm sorry about your engine BJ, 5 more HP sounds like a bargain though haha

[SRT BILL]

Anybody have anything new to report on this topic??

[G37Sam]

Nothing new here. Over 1,000 miles with no CEL *touch wood*

[7TH_SIGN]

I used O2 spacers and removed all four cats. No check engine light.

[BJG32]

Well that is good news ... it appears the O2 spacers are doing the job. These are a must if you plan on doing this mod. Very cheap fix.

My car is still in the shop (2 months now) due to a spun bearing. I should have it back soon, but won't have the miles to give a response to this until next spring.......

[7TH_SIGN]

BJG32, I've actually been in your position before back in 2001 when I purchased a lemon. Didn't have my car for 3 months. It sucks man. Hope you get it back soon.

I only have 50 miles on my O2 spacers but so far so good. Got them off Amazon for $20.

[Stealth]

I had high flows and corsas on my 08 and they was much louder than the highflow/stock combo on the 14.

+1--on my car this was like a nuclear explosion--very, very, very loud. Like an open exhaust. The Police were immediately following me.

My '14 has Corsas with OEM CATs and I like it, but it is more aggressive on throttle. I also have the Arrow PCM so the decal pops are definitely pronounced. Since this is my fun car and not a daily driver, I am fine with this. Stock everything is, predictably, the most quiet.

[7TH_SIGN]

When I was looking for a catless exhaust system, I thought for sure they would all drone and rasp. When Agency Power assured me theirs did not, I had a hard time believing it. Ordered it and installed it. Perfect fitment and absolutely no drone or rasp. Not too loud and not quite. I don't know what resonator they use but it's perfection.

[V10SNAKE]

I went Catless (rest of exhaust stock) on my 2015 SRT, seems to have less drone on the highway. With the Arrow PCM the decel pops are very loud with an occasional flame.......Under hard accel. the car is loud.

Cat bypass pipe....

13992


Hard out of the hole....the Viper in the far lane has 100% stock exhaust.


https://youtu.be/YyTiIpA9v8s

[Jdmuscle]

7th... That's actually great to hear. I might have to go your route. No drone is just the thing I wanted to hear.

[darbgnik]

7th... That's actually great to hear. I might have to go your route. No drone is just the thing I wanted to hear.

Pun intended?:cool:

[donk_316]

I went Catless (rest of exhaust stock) on my 2015 SRT, seems to have less drone on the highway. With the Arrow PCM the decel pops are very loud with an occasional flame.......Under hard accel. the car is loud.

Cat bypass pipe....

13992


Hard out of the hole....the Viper in the far lane has 100% stock exhaust.


https://youtu.be/YyTiIpA9v8s

Who makes this!
Thanks.

[V10SNAKE]

I had the cat bypass pipe(s) custom made, I can remove it and re install the cats as we used the original clamping system.

[SRT BILL]

V10Snake, I like your idea of using the cat bypass pipe and stock exhaust. Are these pipes available to us? Any additional information would be useful.

[donk_316]

Agreed. Usually something like this is the first thing to come to market.

[V10SNAKE]

I had a local custom guy make them up while I looked over his shoulder. He recreated the geometry using the stock cat pipe. My goal was to have a a cat delete pipe(s) I could use for track days using the stock clamps. So far no codes using the arrow PCM as the down stream O2 sensor is disabled. I made sure that he installed a bung in order to place the O2 sensor back into position to avoid damage to the sensor(s). I like the way it sounds so much I still have them on the car.

[SRT BILL]

V10 any concerns with the exhaust fumes or smells??

[7TH_SIGN]

V10 any concerns with the exhaust fumes or smells??

Depends on the quality of the clamps being used and exhaust fitment. My Agency Power exhaust is Catless and has zero smell inside the cabin and very little with windows down only when at a stop and wind picks it up.

[V10SNAKE]

Bill.....yes at a red light the smell does get strong over time with the window down.... With the windows up I use recirc to minimize the smell in the cabin.

[mblgjr]

7th... did you get the stainless or titanium from Agency

[7TH_SIGN]

7th... did you get the stainless or titanium from Agency

Stainless. The titanium is lighter.

[BJG32]

FYI....I have the O2 simulators and I am now getting a new code.

P0159 Chrysler - O2 Sensor 2/2 Slow Response

It appears I will need to do more work if I wan to keep the hi flows.

[donk_316]

02 sims or spacers or whatever the hell someone calls them will always be a bandaid. Grab an Arrow ECM and never worry again, plus the added power.