It has begun.....

[donho]

Originally Posted by JCL

Depends on how you define performance.

With respect to maximum horsepower, I think that there will be very little performance difference with clean filters. Not measurable.

I think that with clogged filters I wouldn't want the K&N ones on there.

I think that the risk of an increased amount of dirt passed through K&N filters into a nice clean engine simply isn't worth it. If airflow is so important, and quality of filtering isn't important, just take them out. You will dust the engine eventually, but you will get maximum performance up until that point.

I think that K&N filters (and other aftermarket 'performance' filters, not just picking on K&N here) exist to suck money out of people who believe their marketing campaigns.

I have to disagree.
I have used K&N in most of my vehicles because I have seen the gains in real world testing. Granted I used AEM in both my QX56s. But that is because I got a great deal on the CAI.

I used them on my Mustangs when they were street cars. and they all picked up. There are many magazine articles that backed this up.
A stock non MAF(speed density) would pick up 1-2 tenths. A MAF stock stang would pick up 2-3 tenths. Over the stock paper element filter. I will spend 35 bucks for 3 tenths anyday!! Dont get me wrong. I know the truck will not be picking up 3 tenths from a filter swap. But saying that K&Ns exist to suck people out of money is a little harsh.

K&N Technical Learning Center - Engine Air Filtration Facts
K&N Air Filter Facts You Should Know