Best Air filter for Volkswagen Jetta

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.

Air filter replaced with a brand new one. Tested the car, monitored the fuel trims. It appeared that drive-ability has improved, however, the intermittent low fuel trims did not go away.

about 35 mpg freeway & about 27 city/freeway daily driver '89 Jetta 4 door 1.8L originally (bored .020 over) on digi2 with a K&N air filter I'm running nothing but 91-92 octane chevron/shell gasoline.

I had installed a K&N air filter and noticed a good increase in power and fuel economy.

So far, I changed spark plugs, ignition coils, fuel filter, air filter and I got a new battery.

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).

The K&N out of the box messed up the MAF on my old 2.5l Jetta, but 2.5l's are notorious for having a delicate MAF with an aftermarket intake.

I've used the air filters made by Amsoil in my current Jetta. I wasn't impressed. The air filter left dust particles on the inside of my intake tube so that was taken out soon after it was installed.

Plugs, Coils, Maf, Front 02 sensor have been changed, I am not running motor mounts of any kind, my car feels so Unsmooth compared to other 1.8t´s I have driven this only seems to happen under low load... you can feel the cabin vibrate... not a lot but defenetely the steering wheel, pedals, shift knob. and the car seems to stop and let go, stop and let go (jerky) whenever I let go off the gas pedal in gear... it feels so unsmooth!!!

i had the same problem when i fitted a K&N filter on my 2000 Jetta, I probably overoiled that thing and it clogged my MAF. I didnt notice any gains maybe its just all hype but I will not use a K&N filter on my Passat.