I've had the gasket ring between the headers and the pipe go bad as well - alot easier to change that then to try tightening old, seized up manifold bolts.
When the car is cold, pop the hood and start the car. Feel with your hand around the pipes and try to feel for the exhaust leak. The pipes won't get hot for a few minutes. Stick your ear down in there to try pin pointing the noise.
Watch out for the fan when you do this!
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