Welcome..
I think you are asking about Slip On mufflers ? I think the most optimistic versions are worth around 3HP (2 Brothers) and weight reduction. I think it is more about aesthetics than performance. If you sound fast... you must be faster
I think you are asking about Slip On mufflers ? I think the most optimistic versions are worth around 3HP (2 Brothers) and weight reduction. I think it is more about aesthetics than performance. If you sound fast... you must be faster