ScootsUSA 190-36-6117 2nd Gen GY6 Round Stainless Performance Exhaust SSP-G 2nd Gen Round Stainless Steel Performance After-Market Exhaust for 150cc and 125cc GY6 4-stroke QMJ152/157 QMI152/157 engine based scooters.(Please check mount type before ordering) Overall Length (muffler): 20 inches Overall Outer Diameter (muffler): 110mm Removable Baffle