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Use a smoke machine to fill the exhaust system with smoke and look for leakage, I have only seen exhaust leaks cause this fault. Now knowing that you've replaced the cat and O2's I would start looking for a lean condition, check fuel trims are they indicating a lean condition? Double check all your exhaust connections and if you find the fuel trims are indicating a lean condition check intake system for leaks especially around the supercharger air inlet. Check Fuel pressure.
- Casey
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