This is a Bisson Inverted Muffler for the DA50 Engine. FEATURES: Aluminum construction Brass pressure fitting (3.5mm opening) Parallel exhaust tubes Pitts style for inverted engine installations One year warranty through Bisson INCLUDES: One Bisson inverted Pitts muffler Two mounting screws (5mm x 21mm cap head screws) One Bisson Custom Mufflers sticker REQUIRES: Installing on the DA50 Engine SPECS: Length: 7.75" (196.85mm) Width: 3.09" (78.5mm) Height: 1.59" (40.5mm) Exhaust Port: 1"x.57" (25.5mm x 14.5mm) Distance between the mounting holes: 40mm (1.57") Exhaust outer diameter 19mm (.75") inner 14mm (.55") lmm 7.13.10 ir/jxs