ive a arrow can and k&n and ive just been round our bypass and give it flat nuts tonight MASSIVE difference!! its well worth a go i was going to put a switch on the wire so i could switch between maps 1 & 2 but i don't think im going to bother map 2 is the way forward :doug air box sucks a treet to mate you get alot of induction noise from the airbox it is a compleatly different bike compared to the standard one i bought a month ago just so pleased with it now so yes mate GET IT SNIPPED:thumbup