I ran a supertrapp on my XR600R dual sport and it had 12 discs in it. Get a stainless hose clamp and surround the discs. The ones that I have have the slots for the screwdrive on the clamp starting about 5 inchs from the screw. So if you place the screw just even with the edge of the rear fender the slots are all pointing down and in so the sound is pointed down. One twist of the screw and it is off and in the fender bag for full power. The screw is 5/16 which is the same as an 8 millimeter which we all carry. It really works great and since they are stainless they look good too!