50 State Legal - Mk45 TOURING MUFFLER for M8 TOURING MODELS - Black with Black Thruster End CapMk45 TOURING MUFFLER for M8 TOURING MODELS Black with Black Thruster End Cap Unhappy with how your M8 bike sounds? The S&S Mk45 Slip On Mufflers will change that. They are the result of decades of riding, racing and tuning. Combining both a stainless steel perforated core baffle with Race TEX cartridge packing, they create a deep rumble and improved horsepower and torque, all while adding a unique look with styled aluminum end caps. Features: Mk45 4.