06-18 YAMAHA YZF-R6: M4 Street Slayer Slip-On Exhaust With Muffler Box Eliminator (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 'Muffler Box' Eliminator Kit (removes catalytic converter) and a polished stainless steel, titanium or carbon fiber canister. Comes with a stainless steel true high flow merge collector - or mid pipe - to remove the stock catalytic converter. The Street Slayer slip-on exhaust system will shed some weight over stock to give your sport bike an improved power-to-weight ratio.