Someone removed the exhaust from the front of the cat to the tailpipe, welded in a 2' piece of pipe then a muffler, so my exhaust ends right under the passenger seat of the B2.
I had a 2006 gmc Serra with a setup just like that when I got it. It had a great sound (although loud) and I never changed it. I never saw anything wrong with it other than the emissions issue.
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