All my friends with them have no complaints at all. Filters great, holds up great, fitment is flawless. Seen dyno numbers from 150hp all the way up to 300hp. The filter works just as great on n/a cars as it does on f/i cars. If your worried about CA smog you gotta remember... its only an intake. It takes a minute to swap your OEM box in for smog checks. :goodjob: