Specifications Pipe Length: 128mm (5.0") Pipe Diameter: 34.5mm (1.4") Diameter at Header End: 15mm (0.6") Diameter of Exhaust Outlet: 8mm (0.3") Inner Diameter at Header End: 10mm (0.4") Inner Diameter of Exhaust Outlet: 6mm (0.24") Distance of Screw: 28mm (1.1") This is special edition bundle with RCECHO Apps license key included for more fun!. RCECHO is a registered trademarks. Products only distributed by authorized seller.