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Im sorry I wasn't more clear when i posted. What happens is, in every gear at ~4300 rpm I hear a very loud vibrating noise. It sounds like its metal on metal, its only that particular rpm, and then it stops. The noise cannot be my exhaust manifold shield because I have headers, and it cannot be the catalitic converter becaue i don't have a cat. I have not been able to reproduce the sound by pushing on the throttle cable, so it might only happen when im driving.
-Dmitriy
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