Avenger 85 Header PP Pipe and screw in muffler

2 Piece Avenger 85 muffler and header PP = Pecker Pipe for a new and complete muffler system.    Includes A85 Blue Exhaust gasket and mounting hardware.  Instead of the YD factory Avenger 3 bolt flange bolted to a riveted muffler this set up is different due to having a screw-in muffler with internal guts more like the original version used on the 66cc/80cc 47x40 engines.  End cap is easily removed for muffler baffle clean out. PP header pipe has Female 1/2NPT and the screw in Muffler has Male 1/2NPT    OPTION: With 1/2NPT treads this means you can also use a small lawn mower engine muffler obtained at local hardware store.   This makes for a more lightweight exhaust but not so quiet.  You say, is this design better than the OEM version?   You'll just have to try one and see.    Should be better by not having aluminum rivets that are known to shake loose, and cause the muffler fall off.