[LT4 650]

A local performance shop said they recently replaced the smashed pipe with a round one...said it was some kit a customer brought in. Had to cut out smashed pipe and weld in round one and it did not cause any issues. They did not know if it made any sound difference because customer also added headers.

Has anyone done anything like this? Any difference? Any reason to do this or not? Thinking about going to 1 7/8 headers and leave stock NPP but wondering if I should replace the smashed pipe to get more sound???