Used PJS Exhaust pipe tail cone, I believe is from a Kawasaki 750 XiR. The Kawi Xir had a PJS pipe from the factory. Tail cone measures 5-1/4" OD at the large coupler, and 2-1/4 OD at the small outlet end. May be able to be used on other pipes/applications where you want/need a pipe to wrap in front of a Kaw 750 engine. NO returns on any used parts, please email with questions before ordering, thank you