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Yup, sounds like a loose heat shield. Check the ones on the collector pipe (2 pipes that combine into 1) and the ones on the cat converter. If they've corroded and one or two mounting points are loose/gone, they can vibrate and make buzzing noises at certain RPM's. Happened with my 83 many years ago and drove me crazy! :mad: My girlfriend says it must have been a short drive. :lol:
 
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