Integy optional twin exhaust tuned pipe set is constructed of aluminum with a natural finish INCLUDES: Tuned pipe with pressure tap and twin exhaust outlets, header, two gaskets, long spring, steel mounting wire, four short springs and set screw SPECS: Tuned Pipe: Length: 6" (153mm) Diameter: 1.1" (27mm) at thinnest point (oval shaped) Diameter of Exhaust Outlet: 0.63" (16mm) Diameter of Exhaust Inlet: 0.55" (14mm) Header: Length: 3.1" (78mm) Diameter: 0.55" (14mm