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1) Loose heat shield. This is pretty common. Get it up in the air and poke around until you find the one that's rattling.
2) Catalytic converter is shot and you have chunks rattling around in your exhaust.
My money's on the heat shield...
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1999 Carrera 4 • Aero kit • 4" UD Pulley
My Corvette doesn't leak oil... it sweats horsepower.
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