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If we were dealing with individual exhausts like a one cylinder motorcycle it would be easy to go with that description ...but my car only has one exhaust at the rear and all four cylinders feed into that... and I think I have two mufflers... which by definition are dampers with regard to this type stuff....
Why do yall reject out of hand the idea of a bad, either burned or dropped, exhaust valve ? That would produce at least twice the sucking backwards of the exhaust stream flow that you are trying to describe as the physics of this situation.
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