Description WE HAVE MUFFLERS STILL AVAILABLE BUT NO LONGER HAVE 6 BOLT ADAPTERS KITS Stainless steel 4 stroke imported muffler, this muffler has been tested at many 4 stroke tracks around Australia and meets noise requirements. Includes slip on 6 bolt adapter to mount to Aussiespeed header pipes. A 6 bolts flange is part of the muffler body. Body 425mm long, Internal diameter of chamber 50mm End cap 50mm long, Body outside diameter 100mm