Usually this is caused by the exhaust, and most common is the heat shield around the catalytic converter. Sometimes these can be spot welded, by I have fixed a few by putting together a few large stainless hose clamps and placing all the way around the unit and tighten them up. Sometimes the rattle is internal, and replacement is the only option. If so, rather than getting a very expensive stock replacement, you can by a universal easy flow hot rod type for about $100, plus installation.
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Usually this is caused by the exhaust, and most common is the heat shield around the catalytic converter. Sometimes these can be spot welded, by I have fixed a few by putting together a few large stainless hose clamps and placing all the way around the unit and tighten them up. Sometimes the rattle is internal, and replacement is the only option. If so, rather than getting a very expensive stock replacement, you can by a universal easy flow hot rod type for about $100, plus installation.