Kurt drove in from Tennessee for our Purple Belt Performance Package, plus Mace Stage 1 valvesprings, retainers and camshafts. The car made 552 whp and 531 wtq (Blue) on pump gas using the industry standard SAE correction factor (566 whp and 544 wtq with STD correction). On E47 fuel it produced 620 whp and 657 wtq SAE (Red) (634 whp and 672 wtq STD). Notice how the powerband is almost completely flat, even at 7,000 rpm!