Universal 35-51MM Akrapovic Exhaust Muffler Pipe Fit for Most Motorcycle Scooter Dirtbike ATV 125-1000cc Nice Sound 1. Fashion design style , a great accessory to dress up your rides. 2. Stainless steel welding adaptor allow to fit pipe 51mm 3. Removable DB killer/silencer, offer different sound effect 4. Reducing overall weight for top performance to obtain max output 5. Professional installation recommended Specification: 1. Stainless steel welding connector 2. We have a welding bracket to fit pipe with outlet 38~51mm. 3. Material: Stainless steel , Carbon fiber ,Titanium Fitment: This Universal Muffler Can Be Used For Dirt Bike, Street Bike, Scooter, ATV, Quad And Any Other Bike With Pipe Diameter 38~51 mm Dimensions: Length: 370mm / 14.6inch; Pipe length: 235mm / 9.3inch Diameter: 105mm / 4.13inch; Inner diameter: 51mm / 2inch Model: A, B, C, D A: All imitation titanium B: Semi-imitation titanium + imitation carbon fiber C: Imitation carbon fiber + stainless steel D: All imitation carbon fiber Please carefully choose your muffler model according to the model marked picture. Thanks very much. Enjoy Racing Muffler. Enjoy Life.