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This is the #873S OS Super Silencer Muffler used for the OS Max 40FX and 46FX Engines.
Direct Fit Optional Part.
Natural Aluminum Construction.
Three Expansion-Chambers Separated by Cone Baffles.
Offers Appreciable Reductions in Noise Emissions.
Exhaust Outlet and/or Pressure-Fitting Can Be Rotated To The Most Convenient Positions.
One 873S Muffler w/Pre-installed Pressure Fitting
Two black steel 3x35mm Cap-Head Screws w/.5 pitch threads
One Instruction Sheet
A 2.5mm hex wrench to install to engine
Diameter: 38mm at largest point including cooling fins
Mounting Hole Centers: 37mm
27mm Length from end of flange to muffler body
28mm Intake Port Height
6mm Intake Port Width
Diameter: 4.5mm line end
Threads Length: 6mm