"Corvette ZR1 with a tune and air filter vs 2013 GT500 with pulley, intake, tune"
I would say 670whp for the GT500 and 570whp for the ZR1. I know there is weight and shape difference favoring the ZR1 but still expected more from the GT500.
I would say 670whp for the GT500 and 570whp for the ZR1. I know there is weight and shape difference favoring the ZR1 but still expected more from the GT500.