If you stilll have heat sheilds around the exhaust system then check then for looseness as these will cause a squeak or rattle noise.you can try to tighten the sheilds or remove them.their purpose is to help keep the exhaust cool.if its a small pin hole in the exhaust it can cause a sound like you have.you will have to find the hole and if the system is not rotted weld the hole closed.if the system is no good then replace the bad part.if the noise is from the inside the muffler you can try to dent the muffler were you here the noise to try to stop it or just replace the muffler.
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