Get an K&N or HKS air filter and never buy another filter again. They usually come with a cleaning kit which is used once a year. One of the better investments I’ve made for my car.
K&N high flow lifetime filter. Higher airflow (you'll hear turbo spool and gain a few HP), and you never need to change it - you can wash it after 50-70,000 mi, or whenever you feel it's dirty enough to clean, but you've never got to buy another filter again...
Buy an aftermarket dry filter (Mann, Filtron etc.) and install that.
Mann filters are excellent.
I 3d printed and designed a cold air intake adapter that works like the Neuspeed intake. I put a big ol’ K&N filter on it and made the car much better on levels of acceleration and throttle response.
I removed the air filter (standard, paper one) and found it clean. I replaced it with a K&N anyway.
I have the K&N one. There wasn't much noticeable difference for mine, although mines a Non-S. It did save me more money long term as I only have to clean it and prime it vs replace it.
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).
I will never again waste money on a stupid K&N.
K&N filters aren't really worth it as the increased air flow isn't going to result in any significant gains since air/fuel ratio is computer controlled anyway. Not to mention you would really need better exhaust and a tune to take full advantage of increased air flow. Also, if improperly oiled, they can cause MAF sensor issues.
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