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
Project Farm says the best 1" filter for filtering and good airflow is the 3M Filtrete 1900, which is a MERV 13 filter (https://www.youtube.com/watch?v=RkjRKIRva58), look at 10:57.
I had a similar problem with my 19 forte and it was because I never changed the engine air filter and the MAF was really dirty. I changed filter and cleaned the MAF and the car worked perfect but when it was dirty the car would shut off when slowing down or at complete stop.
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!
the only advantage to the k&n is the reusability. for actual filtration, oem paper filters are better. power differences, on these cars, i dont think you will see any differences unless you are pushing over 325hp
I've been using a K&N for a few weeks. I haven't noticed any power gains, but the throttle response feels slightly quicker (this could be in my head, but who cares, I'm happy). No difference in fuel economy.
Welp never buying K&N air filters again.
Air filter, I'd stay far far away from K&N, more flow = more dirt getting in and oil could mess up the MAF. Also, you are not going to gain anything.
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