Other things that lead to weird smells:
1) using the wiper fluid jets. The drainage off the windshield drips on the cats. I've noticed a burnt smell after using the wiper jets quite often actually
2) road grime on aftermarket cats. This is especially noticeable in the winter here in Chicago. Salt and grime gets on the cats during a wet road day and you smell it burning off.
3) plastic stuck to aftermarket exhausts. Drive over a plastic bag and it will instantly stick to the hot piping. You'll be stuck with the plastic stink for a few weeks if you don't remove it quickly.
4) oil leaks. Just make sure there isn't any oil leaking from someplace and dripping on the manifolds or cats.
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2013 Cadillac V-Wagon, RIP Z
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