Having cats further down stream will definitely preserve them. Removing the stock cats for HFC's will definitely help relieve some back pressure. I'm thinking of keeping my HFC on because unlike your turbo setup, these superchargers need some back pressure to keep them spinning in their sweet spot. At least that's how I under stand it. Those F.I. cats on the exhaust system are 150 CEL FYI.
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Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI
New Car: Under Construction
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