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I'm in on the exhaust leak. Also - did you loosen EVERYTHING then tighten/torque EVERYTHING from front to rear?
Header > OP > FP > Catback?
Did you ensure a good seal from the gaskets? Start the car while underneath and listen for hisses/leaks?
Did you use anti-seize to be able to remove/adjust without stripping your bolts?
At this point, go to an exhaust shop. Cut your losses and pay someone who has some more experience in what you're doing. No offense.
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