This is a Muffler for Side-Mounted Engines in Biplanes and Scale Aircraft.
This design directs exhaust gas out the bottom of the cowl.
This muffler will fit on the OS Max 40SF, 46SF, 40FX and 46FX Engines.
FEATURES: One-piece welded construction of high quality aluminum bar and tubing
INCLUDES: One Pitts-Style Muffler w/ 2-1/5" long tubes.