Big Twin Flathead / Knucklehead / Panhead

Original replacement mufflers for Knucklehead, Panhead and Big Twin Flathead

The big twins with OHV and SV engines have a pipe diameter of 1-3/4 " and used the same mufflers from 1937 onwards. Our original replacement silencers fit all the models mentioned, even though each model and year group always had its own style. In addition to use them as accurate original replacements, custom applications are also conceivable by mixing different model years and types. The manufacturer of our detailed quality reproductions is mainly The GasBox, a company that has earned an excellent reputation.