Hate to keep this thread offtrack from its original post, but possibly the reason for the slash versus the no slash may be due to the replacement tails were bent on a machine from a straight stick of tubing and the slash wasn't done to it . I know when we were slow I was bending pipes for stock on a machine using bend cards. It was alot cheaper than purchasing prebent pipes. Back then mufflers and tail pipes didn't last very long at all.
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