hmm, havent really done much driving yet, (been doing uni work all day!) it seems to be alot better than the hks style ractive one i had before, not as bad flat spots, altho, seems to dry up on power past 4800-5000rpm. im still waiting for it to arrive!!! it should have been here today, so should be here tomorrow! gotta admit, it does sound good!! but in all honesty, i heard a swift gti with one the other night, and it sounded awesome, so i just wanted it for the noise!! i'll probably be back using the airbox again soon no doubt!! Rich.