So I've heard all different types of things about the K&N drop in filter from different owners. Some say it loses HP, some say it doesn't make a difference at all, while others say they've seen a difference.

I for one like concrete hard evidence rather than speculation as do most of us probably. So I decided that I was going to purchase one and do some dyno testing on it to see if it makes any difference at all.

I wanted to keep the results as close as possible so all testing was done on the same day, same dyno. As soon as I got to the dyno, I was strapped up. We waited roughly 30 mins before doing the first pull, allowing the car to cool off. We did 3 back-to-back pulls on the stock filter. First pull was significantly lower then my previous dyno, but second and third pull was about 10hp less but that was probably due to the fact that it was a warmer day today.

We let the car cool off another 30 mins while I installed the K&N drop in filter, then did 3 back-to-back pulls. Here are the results.

Stock filter results:

Stock Filter 1.jpg
Stock Filter 2.jpg
Stock Filter 3.jpg

K&N filter results:

K&N Filter 1.jpg
K&N Filter 2.jpg