15-18 YAMAHA YZF-R3: M4 Street Slayer Slip-On Exhaust (Carbon Fiber) 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. Street Slayer slip-on exhaust with a polished stainless steel, titanium or carbon fiber canister. The Street Slayer slip-on exhaust system will shed some weight over stock to give your sport bike an improved power-to-weight ratio. Bolt-on and slip-on systems utilize the stock header assembly, but remove the stock canister's restrictions, for better sound and an increase in power.