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.
The k&n air filter is significantly thinner.
I personally have the k&n filter on my 2010 Forester and recently got the reusable cabin filter and have not had any problems.
I have one in both my Forester and wife's Crosstrek. Performance increase? Meh. On my XT it didn't matter, but I did find that the Crosstrek's acceleration from a stop increased nicely. I've had one on my Jeep for over 200k miles with no problems.
I use K&N filters on 3 of my vehicles - my '74 G30 350 V8 Chevy Van tow vehicle, my '93 RX-7, and my F2000 racecar. On the racecar, it is a required spec part required for all F2000 cars using the Zetec engine. In 14 race seasons (~100 races) of use it has caused no issues. My engine builder says my engine always looks good when they get it for a refresh. On the RX-7, it was part of an induction upgrade (the OE intake was very restrictive) and provided a noticeable power increase. It has caused no issues in the ~60K miles it's been in use. On the Chevy van, the OE air cleaner was way too small and restrictive for towing purposes. The K&N provided a significant benefit in gas mileage and power. It has been in use for ~200K miles and has caused no issues. YMMV.
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
the k&n filter does get dirty quite quick but as long as u dont neglect it your golden.
This proves what most people have always said, K&N's don't filter for shit, also FRAMs are no good.
Welp never buying K&N air filters again.
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