ah ok so what would be the best way to this on a stock setup? i've been thiking of going for the k&n as I have heard some ok things about them...still deciding though
I've used K&Ns on every car I've previously owned...
1989 Chevy Z24 [1989 - 1997]
1995 Honda Civic DX [1996 - 1998]
1998 Nissan Maxima SE [1998 - 2003]
1995 Pontiac Grand Prix GTP [2004 - 2005]
1995 Eagle Talon ESI [2005 - 2008]
and cars I currently own.
1983 Benz 380SL
1997 Corolla
2003 Nissan 350Z
2005 Ford Mustang GT
Not once have I had engine problems using them and I've noticed gains in performance, as well as, at least a 2 to 3 increase in MPG.
Because the K&N filter material is cotton gauze, compared to paper filters, it lets air through more freely and the red oil is what helps it trap all the dirt and dust particles as the air passes through it. Even if the filter looks dirty on the outter side, look on the inner inside and you won't see much soot, dirt, sand, etc because the trapped particles also help to enhance filtering.
In normal or typical environments, you can drive your car for tens of thousands of miles and you won't have clean it for a long time, possibly a few years.
But if you drive on a lot on dirt roads, smoggy conditions, sandy, or dusty areas, you may have to clean it a little more frequently, but it'll still perform as it's suppose to.
So, from my experience, I would highly recommend it.
If you have any questions, feel free to send me a PM or email.