It could be they left some part of the exhaust rubbing on something too! If you can get under it, and on a cold system bang up on the muffler and pipes, if it's rubbing somewhere, try to loosen one of the clamps, they are usually 1/2 or 9/16ths, you need a deep socket for clamps, the twist up or down and re test. When the noise is gone tighten clamp.
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Thursday, April 1st, 2010 AT 5:26 PM