"Today's vehicle use various types of computers, JET has a module or computer upgrade to fit almost every application on the road today. The ECM in the vehicle looks at various sensors such as manifold vacuum, coolant temperature, throttle position and RPM, it then processes this information and adjusts spark timing, air/fuel ratio and other parameter according to the tables stored in the JET Performance module memory. By recalibrating these tables we are able to tune the engine for the maximum horsepower and torque under various driving conditions. By installing the JET module these extra increases in performance enhance drivability, towing capabilities, reduce ?? miles times and provide improved overall efficiency."