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sounds like something is loose to me....maybe piping...i would jack ur car up and all fours and inspect ur exhuast starting from ur header, my first guess was ur valve springs but that "burnt" sounds doesn't sound like what my valves are making so i would guess soemthing is loose....just look around ur engine bay and see if there is something loose....make sure u do a close inspection....and have someone start up ur car while u stand over ur engine listening for the noise
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