In fact, a dent would have to be very deep indeed (like a depth of 20-40% of the diameter of the pipe, I would guess) before it would markedly affect the flow of exhaust gasses or cause a hotspot that might promote a burn-through.
The only thing a dent would do to an exhaust would be to restrict air flow. If the dent isn't enough to protrude into the pipe enough to restrict air flow... just keep riding.
I think the black stuff is probably VHT paint, could be hiding a weld repair?
I agree with the other posters, dents like this are fine, although I think what you are referring to is the normal shape of the collector, possibly slightly altered by repair?
Upt'North.
I was the left hand side that was badly damaged - the guy dropped it off today - really serious damage almost bent, so I got a refund. Thankyou for your replies, John.
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