Black straight fishtail 33 muffler set has an outer diameter of 1-7/8 for M8 models. Fishtails are straight through without baffles. The diameter for the stock pipe measures to be 4.33 . The outer diameter for the fishtail set measures 1-7/8 . Extension pipes have channel mount brackets that are welded in place. Includes channel mount on top of the pipe to mount like the original. Use existing hardware and clamps for installation. Not legal for street use! *NOTE: The right hand fishtail has 2-1/2 inlet and the left side fishtail has 1-3/4 inlet.
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