What size pipe did everyone use to join the pipes together? This shop is using 2.5” and stretched edges. Inside of resonator is same size. If you look inside the resonator it actually shrinks down. So that’s why I’m thinking 2 1/2 inches OK. Would 3 inch make a difference if they stretched it and put the 3 inch pipe around the existing pipe and welded it? Probably not but I’m looking for other inside because I would get it redone if that’s the case
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