This is the optional J"Tec Wrap Around Pitts Muffler for the Top Flite Giant P40 when using the DLE-55 or the DA50 Engines. FEATURES: Aluminum construction with polished natural finish INCLUDES: J"Tec Wrap Around Pitts Muffler 5x30mm Socket Head Cap Screw 5x20mm Socket Head Cap Screw Two 5mm Lock Washers Instruction Sheet REQUIRES: Blue Loctite for mounting screws, TTRE9052 RTV gasket material SPECS: Exhaust Tube Length: 5" (127mm) Exhaust Tube Diameter: 0.90" (23mm) Muffler Can Length: 5" (127mm) Muffler Can Diameter: 1.5" (38.2mm) Distance Between Mounting Hole Centers: 1.6" (40mm) jxs 08/16/11 ir/jxs