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Discussion Starter · #1 ·

What should be the outer diameter of the end on the header exhaust pipe on a CB450 K1?
I am not sure, but I think the PO owner of my bike may have welded an extra piece on top, because now the diameter of my pipe is 1.9inches (48.0mm). I had a hell of a time removing the muffler from the head pipe. Can anyone else confirm if this is the case?

Here's a pic

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