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!!!!
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!
I love my green filter to death, needs to be cleaned lol, but I absolutely love the sound. Everyone keeps telling me to get a blow off valve but the green filter is all it needs, more than enough intake noise and turbo flutter
Well even if you don’t take off the AirBox lid, the green filter is 100x better than stock. I personally loved Green over K&N because it’s bigger and green is fun compared to black. I have my intake lid off and hear turbo, BOV, and other noise. It’s great!
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.
Green filter + no airbox is the way to go. It might be a little louder with just the filter, but im not sure by how much. I went years without the airbox lid, its all good
I have an OE replacement filter in my GTi. Can I tell a difference? Not much in the GTi
last night everything was all normal, K&N filter in the stock airbox with one side cut out. sounded pretty nice. ive had this setup for a little over 6 Months .. Today i start my car and head off to work as normal. and i notice its being very very quiet (almost stock sounding)
I've been an OE filter fan since about 1999. Then I had an '87 Carrera and built a killer NA motor, Euro pistons, SC cams, ARP bolts everywhere, Ti bits, SSI headers, custom muffler, a custom Autothority chip, and a big fat K&N air filter. I was detailing the car for a concourse and removed the K&N. The intake runner was covered in gritty dust/dirt.
I wouldnt use the k&n though. They dont offer any real advantage and the oil a k&n uses can foul the air mass sensor.
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