This used canister muffler fits a Mac Performance 4 into 1 collector exhaust for a Honda CB500K or 550K, 1971-78. Inside diameter is 2.25" or 57mm at clamping end and it comes with the
clamp, however there is no hanger hardware. I have include 2 photos
showing the muffler installed with Mac Performance collector pipes.
Please note* If you don't have the Mac Performance 4 into 1 collector, the muffler or collector pipe may need modification to fit. Hanger hardware not included.