I had a friend with something similiar to your problem. He had an exhaust leak. If you exhaust is stock, and even if it isnt, look underneath the car for a black streaks around the joints in your exhaust system. These indicate leaks. Make sure you check everything from the headers back even above the mufflers. It doesnt have to be a very big hole or leak but it it enough to make that noise. Also, the rattle might be a loose exhaust hanger or something. Sit in the driveway and just rev it if it gets worse than it's a leak.
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