14-19 HONDA Grom: M4 Low Mount Ceramic Full System Exhaust (Black Ceramic) 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.Low mount full exhaust system with stainless tubing and custom bespoke black c