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well ... Prodrive considers Turbo upgrade, muffler, exhaust mid-pip, a free flow catalytic converter / down-pipe, a cat-less up-pipe, a silicone intercooler Y-pipe and ECU upgrade to be stg3 ... its all about the degree of the tune which would make it stg3 according to prodrive. Basically an additional 60-90whp is what they consider stg3
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