M4 spends extra time on research and development to ensure your system has the ultimate in quality workmanship.
M4’s unique silencer packing gun insures even distribution of packing material to help unleash that deep powerful exhaust note your bike was meant to have.
All systems are manufactured from the highest quality stainless steel, carbon fiber and titanium when applicable.

"Retro Drag" slip on system with TWIN BLACK mufflers.

Twin black retro-drag style slip-ons give the busa a cool and unique look and sound! Saves 21lbs over stock and adds 6.2 horsepower @ 11,000 rpm