907 votes
I got a K&N filter and I like it, though it ended up being a tad on the large side. I don't think it matters much compared to any other cone filter, but that's just me
Ran a K&N for years in my Focus SVT, put on a supercharger and blew it up…with 110,000 K&N filter miles the cylinders still had cross hatching. I suspect that means the filter did its job
I've been using the K&N for three years.
I swap it for a new one every couple of years because washing it and re-oiling it is a pain and an art form! As the K&N cost twice as much as the paper filter but I keep it twice as long, it doesn't cost me more money.
The power gain is probably 0.0001%. but the filter changes the noise of your engine ever so slightly, it's slightly more aggressive. I'm about to have a Racing Beat ram air duct fitted which will add another 0.5 HP and some more aggressive noises.
On a serious basis, your car will breathe slightly batter with the K&N, so that's a benefit.
The K&N can "leak" some oil and it doesn't filter small particles as well as the paper filter. This means your MAF sensor is at risk of being contaminated. But I have it cleaned twice a year when I get the car serviced, so that solves/avoids this particular problem.
All in all, go K&N!!!!
Thanks for posting this question, mine came with the K&N from the previous owner and the airbox baffles removed. I put them back in along with a new paper filter early on. When that soiled I remembered the K&N was hanging out in a box. Bought a cleaning kit and did my best to follow the directions, removed the air box baffles again (I had at the time recently read about how it may increase flow and improve the sound of the intake), and once clean, popped the 'wet' K&N in.
Fast forward 6k miles and I start having a bit of a rough idle even after all new upgraded ignition components, starter, battery, premixing, and cat delete and so I decided to check the MAF (which I had cleaned back when replacing the SSV solenoid) - fucking filthy! Oil all up in the throttle body. That shit let a mess in there, man! Cleaned the MAF and back to paper we go. Car is healthier than it has been since I have owned it. The intake on the 8 was designed very thoughtfully and very well to run stock components - paper filter and baffles included. I regret messing with it based on old ass posts on RX8club from before the info others have posted here was well understood.
I swapped all this, gas pedal, coil packs and checked all plugs, throttle body with TPS and IAC all as one unit, fuel pump, filter is already new. I did one thing at a time then test drove it, nothing made a difference in the issue. So I thought let me go back to the 2008 MAF, (had the 2006 MAF in it), I'll clean the 2008 MAF real good, and run with the Cone style K&N filter off. It took a few miles but it was a near instant fix, it ran perfect. I stopped and put the K&N Cone style air filter back on and drove 3 more miles, and it started to act up again and stalled on a slow turn. So I put the OE Air Filter box and tube etc.. back on, and WALLA!! It runs perfect. It was totally an Air Delivery issue!
The only things the k&n filter will do is add dust to your engine, warm air for your engine, intake noise to your ears and annoying raspy sounds when you WOT.
I'm gonna guess it's like k&n or aem. I've got k&n without the lid and I get some noticeable intake noise and when I shift from inside the car.
Getting 41mpg with a little help from K&N air filter.
Yup, I already ordered a sinister diesel intake, the K&N really didn’t perform well on the truck, goin for more flow
I wind up usually coming back to K&N as I have ran them in about 5 different vehicles over the years including in Corvettes and 8cyl. trucks. I prefer them unoiled after cleaning that way you minimize fouling the maf sensor. As far as performance gains in my 1.4l base Jetta- throttle response is a bit improved but I don’t know if there is a gain in hp (6spd manual as well).
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