Air filter K&N or Wix

I use one and I have no problems with mine. I have a 2015 Trd or. Just follow the instructions carefully on proper maintenance and I too feel the difference every time I clean it. I never had a maf issue

I replaced my factory air filter with the K&N one and noticed a much smoother idle and even slightly better throttle response.

Brought a throttle body spacer, knock off K&N filter, and 08 air intake tube. Big improvement on acceleration and gas mileage. Was getting 12mpg in heavy city stop/go…now I’m averaging between 15-16 in the city. But you do go thru gas much faster stepping on it.

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!!!!

I threw one in my Dakota I had before the GTI and I could notice the difference.

I have an OE replacement filter in my GTi. Can I tell a difference? Not much in the GTi

All the tests I've seen suggest the K&N's allow more dirt through than a paper filter. You also have to clean and re-oil them periodically. If you use too much oil you might be looking at a new MAF sensor which can't take oil contamination.

There's no performance difference over a paper filter.

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.