This is an In-Cowl Muffler for the TOP FLITE BEECHCRAFT BONANZA and Cessna. / / FEATURES: Pre-tapped in-cowl muffler / Works w/most OS and SuperTigre .60-.75 2-stroke engines. / (We don"t have headers for the really old engines in these sizes) / **(NOT FOR USE WITH .90 OR LARGER ENGINES! it is too restrictive!)*** / / INCLUDES: One Muffler / Two 1/8 x ½" Black Self-Tapping Screws / Two Black Washers / One Pressure Fitting / / SPECS: Overall Length: 4" / Width: 1½" / Exhaust Port Outside Diameter: ¾" / / REQUIRES: Header (match to engine as listed below) / .61SF & FX header: TOPQ7920 / SUPERTIGRE header: TOPQ7925 / MGC 7/25/97 / ir/jl