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

adam83 said

I snapped some pics from underneath while they had it on lift. Looks like I have a couple floor pan plugs missing

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IMHO, the dobie that did the job cut the pipe off just ahead of the muffler, banged the new muffler on and welded it. If the tailpipe is a stock replacement it would be 2" to 3" too short. You would have thought the old muffler would have been leaking also and missing body plugs would have let the exhaust in.
Hard to get good work done properly now. Ethics is quickie fix and blow it out the door. I could not work like that and quit pulling wrenches. Then instrumentation in the oil patch. Dealing with numb nutz that barely graduated high school. Gave that up also as I was tired of coming home frustrated. Better at home broke but no road apples dumped on you all day.