1971 Duster exhaust smell in cabin after new muffler and tail pipe

Ok, I went back to the shop. They extended the pipe and cleaned up the end. I'm not thrilled that there's another weld in the pipe now, but they didnt argue with me about fixing it, it's not a performance exhaust, its functioning correctly and theres no leaks so ill live with it.. Definitely never gonna go back though!

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