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Do you have an aftermarket header or any other exhaust components? My gasket from the header to overpipe was causing an intermittent rattle because it wasn't torqued down evenly. Loosening the front pipe mounting bolt before tightening the joint along with some ultra copper RTV sealed it right up. If you've got the stock header, it could be the heat shielding around it. Check to see if anything has fallen down onto it. Last time I jumped a friend's car, I noticed the positive battery cover had fallen off and was laying on that heat shield.
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