Join Date: Feb 2005
Location: Tony Blairs Britian
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Get under the car, find the heat shield and try giving it a little wiggle, it shouldnt move but as moe19x mentioned, the area around the washers rust and eventuly rust away leaving it unsecured, hence the rattling. If you can get the bolts off (assuming this is the problem) just stick some big washers on that cover the area thats been rusted away. But also as thekid said, a few more details might help, could be a worn flange holding the exhaust up thats rattling, or it could be a knackered cat, although that sounds more like crackling.
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<span style='font-size:9pt;line-height:100%'>It's better than doing crack.</span>