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  1. S197 Roush Stage 3 vs S550 Roush Stage 3

    Looking at the two generations, I see a 100hp difference between the supercharged stage 3 cars (575 vs 670). Doing some basic Googling of these cars yields the TVS blower is "all new" for the 2015+. Did the new blower provide the entire bump in HP or was other tuning employed in conjunction...


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