Piston. It is called "no traction". I runs similar to SaleenGTS's numbers If your 60 ft's stay 2.0 or slower it is damn near impossible to hit 11's!!!! (unless you trap around 125-130)
Anyway, when my car dynoed 270 hp, and like 305 tq, I was running 12.8's @ 109-110. My track weight was approx 2950-3000 lbs. A stock 5.0l coupe weighs around 2900 lbs.
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