Great look for my yellow and black R1. The sound and power difference is very noticeable.
M4 Exhaust manufactures exhausts which add power and a more race-inspired sound to your bike as well as lowering the overall weight. Extra time on research and development ensures your exhaust has the ultimate in quality workmanship, ease of installation, and the best performance possible for your motorcycle. M4 Exhausts are available in both Standard / Race and GP Series mounting configurations.
Note: All M4 systems are designed and intended for closed-course competition use only.