to be fair
even a 172 sees zero power gains with an induction kit and the most people have shown have been 1-2bhp... that's on a 2l!
so really isn't worth worrying about air filters except for if you like the sound
my simota sounds really good, not massively loud so not too chav tbh.. but, I doubt I'm seeing power gains. I'd actually expect losses as I haven't put a CAF to the front fog light or anything yet.. just running into behind the headlight