For sure it has to be somewhere above 550BHP genuine.
Do you need to remove the catalyst to achieve the 6.2 second 100-200? I guess I find it a little hard to believe even a 5" body 100 cell could flow 70+lb/min without a fairly drastic pressure drop across it.
I have seen on 2 different piston T4 turbo cars 4" body 200 cell catalysts become big chokes even at 440BHP genuine.
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