Dyno and track tested by Honda R&D in Japan, American Honda MX Team, and HRC All Japan MX Racing Team.
3-stage header provides broader overall range of power and throttle response.
New tail pipe divider creates smoother exhaust flow and better velocity to the right and left tail pipe.
New compact forward positioned RS-9T dual muffler design provides lower center of gravity for better mass centralization. *Larger RS-9T core creates improved throttle response, and power in mid and top end.
New RS-9T mufflers have more volume than stock to provide a decrease in overall dB noise level.
Works with or without Honda's new optional electric start system.