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  1. 2021 GT Manual Transmission Stage 2 Roush supercharger ,active exhaust , rev match.

    I have a 2021 GT and just added a Stage 2 Roush supercharger. It appears the new ecm programming greatly effects the active exhaust and rev match. The car no longer has the aggressive exhaust . Downs shifting no longer has the quick throttle snaps . It sounds more like downshifting a dump...


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