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My exhaust noise is a flapping flutter sound from the right side of the engine when warmed up real good and under a load. You cannot make it do it in the driveway revving and looking. I believe it is at the manifold to pipe gasket. Will try tightening it the weekend. It got a little worse when it installed MGW shifter and jostled the tranny/engine slightly. The noise started on a long freeway trip in hot weather last October when the car had 1000 miles...yes it has to be at least 2500 rpm and under a load
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