The HyperPAC, Hypertech?s Performance Automotive Computer, allows you to power tune your vehicle for more horsepower and torque, perform runs just like you?re at the drag strip, dyno test your engine to compare gains from aftermarket modifications, monitor virtually every engine and transmission function as a digital or analog gauge, diagnose problems, and clear ?check engine? lights. The HyperPAC will also interface with an optional Hypertech exhaust gas temperature (EGT) module to display important information that may not be available from a diesel vehicle?s computer.