Stage 1-For stock or mildly modified vehicles. Fuel and timing curves modified for optimal performance and mileage using midgrade fuel (89 octane or better recommended). Good for daily driving, towing and street performance. No other modifications to vehicle required

Stage 2-Designed for the performance enthusiast, the stage 2 features more aggressive programming to make the most horsepower and torque available. Requires use of 91 octane fuel, 180 degree thermostat and free flow exhaust. Also works well with aftermarket intake systems, mass air sensors, TBI spacers, etc.