y-pipe question
only in a spot, I would leave it be. A small dimple won't bother
anything. Since the Y comes apart in several pieces (at least,
my "catted" one with the cats replaced by steel tubes) you
might be able to peen it out some with a piece of 2" iron pipe
as an inside "anvil". But you're pretty much guaranteed to ruin
what's left of the coating that way....

