This Is An Optional Muffler For The / OS Max .35-.40 FP, .40 LA, .32 F, .32 SX Engines. / It Is Quieter Than The E3030 (OSMG2873) That Come With These Engines. / / FEATURES: Rotatable Exhaust Outlet and Pressure Fitting For The Most / Convenient Positions. / Has Three Expansion Chambers Separated By Cone Baffles. / Quieter, More Pleasant Flying. / / INCLUDES: One E-3030S Muffler / One Muffler Assembly Screw and Nut (N/A 4/30/99) / Two 3 x 30mm Mounting Screws (OSMG6904) / Two 3 x 27mm Mounting Screws / / SPECS: Center To Center Of Mounting Screws: 35.5mm (1-13/32")