Cat removal?

[Fatboy 18]

Does the smell enter in the vent flaps in the rear quarter? I don't see how it comes in on a rear exit exhaust.

Sometimes, it depends how good the seal is on those rear cabin pressure release flaps, AND weather you have a window open, sometimes the gasses can swirl around at the back of the car, depending on wind, it can sometimes make your eyes slightly sting.

This was one of the reasons I changed the rubber fabric material on my rear vents, (we talked about that on the other thread)

[Rizzo]

I ran my 98 with no cats. It was awesome. Very cool to the touch. Only place I noticed the smell was if I started it in the garage but other than that I never smelled a thing. I took the cats out of my 05 as well and it didnt bother me. My 2010 has the Bellanger high flows in with no mufflers and its LOUD at WOT but no smell at all from this one. With the exhaust going out the back on yours I would rip them out if you can.

[Sybil TF]

I ran my 98 with no cats. It was awesome. Very cool to the touch. Only place I noticed the smell was if I started it in the garage but other than that I never smelled a thing. I took the cats out of my 05 as well and it didnt bother me. My 2010 has the Bellanger high flows in with no mufflers and its LOUD at WOT but no smell at all from this one. With the exhaust going out the back on yours I would rip them out if you can.

I am starting to think that the smell comes when the flap vents are not working properly, we shall see if mine are...

[WDW MKR]

I think some are just more sensitive to the smell than others. Every car without cats has an increased fuel smell regardless of exhaust exit location. Mustangs, Camaros, Vipers... it's worst when driving with the windows down. My GN was the least offender likely due to the turbo. You actually don't notice it much while driving... it's once you get to where you're going and away from the car before you notice the smell on your clothes.

Some mind it and some don't. It's like debating whether an interior is black or charcoal

[Sybil TF]

I think some are just more sensitive to the smell than others. Every car without cats has an increased fuel smell regardless of exhaust exit location. Mustangs, Camaros, Vipers... it's worst when driving with the windows down. My GN was the least offender likely due to the turbo. You actually don't notice it much while driving... it's once you get to where you're going and away from the car before you notice the smell on your clothes.

Some mind it and some don't. It's like debating whether an interior is black or charcoal

Well, we have had cars with no cats and never smelled a thing so this is new to me...

[Damn Yankee]

Cats work by exhaust dwell (heat).

Cats = heat, especially and most specifically when you are running rich.

No cat = pipe heat only and the additional heat of potential pipe junction turbulence.

Having said that, if:

1. You are not running headers
2. Have a pretty much stock rig all the way up to a 10lb supercharger (or as per.)
3. Don't make a habit of standing still in traffic for a l-o-n-g time.
4. Have a well tuned Viper
5. Have a well tuned Viper

Leave your stock cats alone, as all you get is a somewhat cooler sill in exchange for lots of noise, gas smell, a car that is an honest to God moving felony. In the worst case, you can wrap the cats (paying attention to 6:00 pathway dump.) Did I mention tune?

Best

[Sybil TF]

I have the M&M headers with Belanger hi-flows and a 3" Borla single mufller behind the cats. Going to get the T&D RR's that i have installed and dump the cats at the same time and get the tune hopefully.

[Sybil TF]

a car that is an honest to God moving felony.

Exactly what I want, As much HP/TQ as possible, loud and obnoxious....LOL if someones eyes burn driving behind me, mission accomplished. As long as mine don't

[uvbnbit]

non-Ghetto solution compared with the zip tie thing. I can't help but picture a couple of dingle-berries hanging under the frame from the rear. Seems dirty but whatever floats your boat.

Just to clarify, I'm HILLBILLY.... not ghetto, and smooth sailin' on this old boat.

[Camfab]

Exactly what I want, As much HP/TQ as possible, loud and obnoxious....LOL if someones eyes burn driving behind me, mission accomplished. As long as mine don't

The car will stink and you will smell it. Your not going to gain more than a couple ponies, seriously. If your car isn't built (big cam and heads), it's going to sound like crap. Just run a high quality metal matrix hi flow cat. The sills will be about 50% cooler, the car will definitely be louder and it won't stink. I've done every possible combo on my car from the time it was bone stock to built N/A. Every combo has been on the dyno, so I speak in all honesty.

[Camfab]

I just realized you already have headers and hi flows with Borla's. Say hello to drone. One things for sure, it will be obnoxious, like a UPS truck.

[Sybil TF]

I just realized you already have headers and hi flows with Borla's. Say hello to drone. One things for sure, it will be obnoxious, like a UPS truck.

Sweet!

[Bugman Jeff]

I bought non-foulers because my car is catless. I never got around to installing them because I've yet to have the check engine light come on. Some cars seem to need them, some cars don't.

[Sybil TF]

I bought non-foulers because my car is catless. I never got around to installing them because I've yet to have the check engine light come on. Some cars seem to need them, some cars don't.

What year viper you have?

[Bugman Jeff]

It's a '97 GTS.

[ViperTony]

Just to clarify, I'm HILLBILLY.... not ghetto, and smooth sailin' on this old boat.

Hillbilly is OK in my book!

[Matt Dillon]

I just realized you already have headers and hi flows with Borla's. Say hello to drone. One things for sure, it will be obnoxious, like a UPS truck.

a UPS truck with a Hole in the Muffler! at least that's what one of my Buddies sounded like to me but hopefully yours won't! You have a few Mods that he didn't so the sound may be a lil' different, Maybe Not! GL!

[Darth Menace]

I too have looked at this, but haven't pulled the trigger yet. I just have some issues with this, but haven't driving in a Gen 2 other than mine (ever) so I can't comment from experience. I know the CEL is an easy fix so I am not worried there.

I had a 93 stang 5.0 with no cats and it was miserable to drive with the smell. It would make people's eyes water if they were driving behind me. My guess is a 8.0 vs 5.0 would only make the stench worse.

Also, I notice there is the bend from the manifolds and then directly when the exhaust goes straight at the side sill is the cat. What do people get muffler shops to do in this case? A small peice of exhaust to go over the manifold, and then flared into a 3 inch pipe to then attach to the exhaust? Pictures here would do me wonders. \


Do people clamp or weld the cat delete to the manifold? A clamp would be easy if the traffic police give us a "fix it or ticket" to change it, but I don't wan an obnoxious exhaust leak

[Sybil TF]

I had a 93 stang 5.0 with no cats and it was miserable to drive with the smell. It would make people's eyes water if they were driving behind me.

As long as it doesn't get in my cockpit then I don't care lol. We have had other performance cars with no cats and didn't smell anything which I guess every car is different?

[Mopar Boy]

I ran catless for 6 yrs, zero heat. installed hi-flows 2 yrs ago and was surprised how much difference (hotter) sills were even with hi-flows.
As far as rear O2's go, either install foolers or install bung plugs and zip-tie them up out of the way. PCM thinks cats are working great LOL

Do you need a set of cat delete pipes?

I left my 02s at the rear in place, I did not try to turn them. Instead I run 02 sims, you unplug the 02 electrical connector then connect up the 02 sims which is some sort of electrical wizardry that stops the car throwing a fault light every 60 miles or so

Note: I believe a law has now been passed making the selling of these items illegal? I would ask around to see if anyone has them

Soooo, in a state (like Cali, or Ontario) that does Etest via OBD port ensuring there are no CELs hard or soft, will these foolers/sims not still show a CEL of some form?

I have no cats no nothing in my side sills and never had any issues on my 96 GTS with heat. Warm feel at best. Sounds ten times belter with them off that's for sure.

How does your car pass etest in Ontario?

[Darth Menace]

As long as it doesn't get in my cockpit then I don't care lol. We have had other performance cars with no cats and didn't smell anything which I guess every car is different?

Problem is it did get in the cockpit, but obviously not as bad as those behind me. I just didn't care for the sulphur smell.

Sybil, send me your hi flo cats for a poor man's fee

[Leslie]

When I had a GenII I removed the cats.
Less heat inside, min. smell, loved the sound! $50

[Bugman Jeff]

Also, I notice there is the bend from the manifolds and then directly when the exhaust goes straight at the side sill is the cat. What do people get muffler shops to do in this case? A small peice of exhaust to go over the manifold, and then flared into a 3 inch pipe to then attach to the exhaust? Pictures here would do me wonders. \


Do people clamp or weld the cat delete to the manifold? A clamp would be easy if the traffic police give us a "fix it or ticket" to change it, but I don't wan an obnoxious exhaust leak

My cat deletes are clamped. It's just a straight piece of pipe, it doesn't need to be anything fancy. They were actually disconnected when I got the car so the exhaust was just dumping into the side sill. Back in place and clamped good and tight, they don't leak. If you do by chance have problems with them leaking(which is unlikely), you can put some high temp silicone on the pipes before you slide them together. Here's how mine looked before I reconnected everything:


I've never noticed any exhaust smell in the car either, though I'm used to driving older catless cars so I might be immune to it.

[Darth Menace]

My cat deletes are clamped. It's just a straight piece of pipe, it doesn't need to be anything fancy. They were actually disconnected when I got the car so the exhaust was just dumping into the side sill. Back in place and clamped good and tight, they don't leak. If you do by chance have problems with them leaking(which is unlikely), you can put some high temp silicone on the pipes before you slide them together. Here's how mine looked before I reconnected everything:


I've never noticed any exhaust smell in the car either, though I'm used to driving older catless cars so I might be immune to it.

Thanks for the info. I don't know if I am going crazy but I think my car looks a little bit different there. My cat ends and then the bend immediately starts. Meaning if I cut the cat off, I don't think there would be enough room to put a straight piece of pipe before the bend. I might be on crack, but I am sure I have looked a few times. Plus the midpipe right after the manifolds is not a 3 inch diameter like the Magnaflow exhaust I have. Like I said I don't think I have the same set-up as you considering you have one straight piece of pipe there and mine wouldn't be close to working with that.

[Sybil TF]

Thanks for the info. I don't know if I am going crazy but I think my car looks a little bit different there. My cat ends and then the bend immediately starts. Meaning if I cut the cat off, I don't think there would be enough room to put a straight piece of pipe before the bend. I might be on crack, but I am sure I have looked a few times. Plus the midpipe right after the manifolds is not a 3 inch diameter like the Magnaflow exhaust I have. Like I said I don't think I have the same set-up as you considering you have one straight piece of pipe there and mine wouldn't be close to working with that.

This is what I had done with stock exhaust before I had the headers installed. Went with the band clamps on there now with the headers but I didn't get any pics.

When you cut the cat off make the cut right next to the cat. The one above was cut wayyyy to short....