Stage 1 - Daily driver. Good for 30hp over stock. Good emissions (smogable). 1997 GTS (9.5:1 compression) = 498 hp / 540 ft lbs
Stage 2 - Perfect for street/strip or slalom racing. Heavy mid-range punch to top end. Increased compression, head and computer modifications (ECM). 1997 GTS (10.5:1 compression) = 549 hp / 567 ft lbs
