Air filter Mann or K&N

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!!!!

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'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.

I ordered and installed a k&n air-filter in my 19 Jetta r-line 1.4 and it seems to have a little more pep.

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)

In my passator, I had a KnN right on the maf, it felt awesome but when the engine gets hot, the hood thermo liner didn't let any heat escape, to the car felt like an 8v

I had one in mine for a little while before reading around and watching videos on these. I noticed my engine made a louder ticking noise with it and I saw absolutely no gain let alone one that would offset the cost.

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.