Depends on who launches better and who is driving. The C6 has a lot less weight than the coupe CTSv. I would think the best outcome would be quicker ET for the vette but a higher MPH for the CTSv.
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Trey
Current rides: 2000 BMW 540i/6 and 86 C10.
Former ride: 1979 Trans Am WS6: LT1/T56, Kore 3 C5/6 brakes, BMW 18in rims