my car is running great. I have stock mufflers w/ dumps tho. (cut off tail pipes and some down shaped one put on). I noticed when you give it a fair amount of gas in 2nd, sometimes 3rd and usually 4th you can feel a knocking feeling under the car against the floor board. Not real bad but you can feel it. Could it be the exhaust or is it the driveshaft or trans? I have no idea about what this could be.
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