Black Muffler Specifications Potentially add more performance, speed and power to your bike with this high performance exhaust pipe Also provides a stylish look and a deeper exhaust tone Comes with brackets welded to the pipe for the GY6 application. (some modification may be required). It will not just “bolt on” to every scooter model. You may need to bend the brackets or make other modification to make it fit. Please Note: All head pipes and brackets are chrome plated carbon steel. Kit Includes: Exhaust muffler, Exhaust pipe, canister clamp bracket, Mounting bolts and gasket 4″ Canister width, 2″ Inlet, 20 1/2″ Canister Length 521mm X 101mm x51mm Fits Models GY6 QMB 139 49cc 50cc Engines