Stock quality muffler/silencer typically used on size 50cc and 70cc 2-stroke gas scooters of the Yamaha Jog clone variety This muffler is painted black steel. Description Stock quality muffler/silencer typically used on size 50cc and 70cc 2-stroke gas scooters of the Yamaha Jog clone variety. This muffler is painted black steel. WARNING California Residents : Proposition 65 Warning Specifications Overall Length: 17″ Case Length: 15″ Case Diameter: 4-1/2″ Exhaust Length: 2″ Exhaust Diameter: 2″ Mounting Distance : 2-3/4″