Cobra 631159 Center-Pro Slip-on Muffler (H-D FLH, FLT '09-'15) Industry first, center-port exhaust with superior performance Unique 2-into-1 design Both mufflers join at the rear beneath the fender for center port exhaust location Slips on as a single unit to the stock or Cobra head pipes Not designed to fit on motorcycles using extended bags