Cycle Shack - FX 4-Speed Models 1 3/4in. Muffler And Drag Pipes1-3/4in. O.D. head pipes. 2-1/2in. O.D. tapered mufflers. 16-gauge tubing. True 1-piece construction. All steel baffle. Show-chrome and great ground clearance. Must use late model swing-out style kick arm, old style kicker arm may hit pipes.