Hey everyone i am sure this question has been asked numerous times. I have searched threads and cant find an answer. I am shopping around for a slip on and am wondering what the diameter is , so i will know if any modifications are needed. I have honestly considered going back to a stock can because the one on there just doesnt sound the way i want it. Thanks again for all your help. This is my first one and i dont quite have the service manual yet. The bike currently has an RSR muffler and it honestly sounds tinny and reminiscent of a two stroke and its annoying the hell out of me.