From their website...
Equip your vehicle with a Power Control Module (PCM) from Jet and release high-performance gains from your engine! Jet's dynamic spectrum tuning (DST) provides power gains across the entire power band, not just at full throttle. The Jet Performance Chips Power Control Module provides ignition advance, point-by-point air/fuel ratios, and gains of up to 25 horsepower. It also improves throttle response, acceleration, and your vehicles low-end torque