100% k&n.
had one in my s15 got it tuned with it,
when it was idling i take it off made no difference to idle.
tried my mates foam filter(had just been cleaned and oiled)
car staled!!!!
i got the K&N stock replacement air filter, then im going to run a ram air intake. sometimes if done wrong the cone ones suck in alot of engine air, which isnt helping it much.
The Pain Of Discipline Is Far Less Than The Pain Of Regret
keep in your air box tightly sealed so it dont suck hot air in.
make up some piping to go under your wheel guard to your airbox and seal it tight so it only draws air from there away from your engine bay.
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