I too am skeptical of any significant power increases--someone put one on a dyno--let us all know. That said I have one from IAP. IMO, overall a poor value. While the filter and AFM flange are OK. I had to grind away some excess casting bumps and then make my own bracket as theirs is Junk (notice capital J). As far as sound goes, it's better but almost too good--lots of undampened valvetrain clatter when under load--I once gave a blind man a ride and he commented on my "detonation problem". Looks OK when you trash the supplied bracket and make your own.
Soon to have a heat shield.
Paul