I went ahead and purchased a set of the Z1 metal gaskets for the connections between the headers/ART pipes and the ART pipes/y-pipe. I'll get under the car once they arrive and try replacing the gaskets that came with the ART pipes with the new Z1 gaskets. I've read a lot of good things about the Z1 gaskets resolving most exhaust leak issues. I was able to find a few local dyno tuners in the Nashville area too so I'm going to call around this week to see what I can have done. Thanks for your help! I'll provide an update once I get this all sorted out.
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