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I don't know what exhaust system I have since it was already on the truck when I bought it. The only thing I know is that it is 4" and the bottom leaf (the flat one) hits the pipe.
I would like to get a new exhaust anyhow since they hacked this one in and just wanted to see if anyone else had this problem before I start cutting things.
Dont know codes, but when I installed an f350 pack the bottom thick flat bar hit the exhaust. It hits because it has no arch, remove it and swap in two leaves from the ex's pack.