If you add both an aftermarket air filer AND a pipe, you WILL need to add an AFR tuner programmer. Add one or the other, you're OK without it, but both will require the programmer. I personally love the sound of the z800 Rotax based clone compared to either the Polaris 900 P-Twin or the Arctic Cat 700 Twin. They both sound like outboard motors and I'm kinda sad I won't get to hear the rumble of that nasty Twin on my ride.