There is a chance that the sound could be an exhaust leak... If you have a leak before your 02 sensor that would also cause your car to run richer. The 02 would be reading slightly lower numbers because of the leak and the car ECU would add more fuel to try and compensate. I'd try to get some time on a hoist and see if you can find any exhaust leaks.. if you still have stock manifolds this is going to be difficult because of the heat shields.
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