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Since things are so quiet... my new car!

You might also look at the tailpipe. If someone backed into a curb and bent it over, it will act like a bad cat.
Takes two people to do, but in the old days, to check for plugged cats, muffler, and collapsed inner pipes, we'd get the car up on stands, drill a 1.8" hole before and after the cat, before the muffler. Use a fuel pressure gauge, with the pointy tip, hold it up to the hold, have second person start and rev it up to about 2K, see what the pressure is before and after the cat, and muffler.
Can't remember the go/no go, but they should be close. If a lot of pressure before the cat, and none after, yup, cat's dead.
Plug the holes with a pop rivet.
 
Nice trick!!
 
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