Jet Performance Chips offer the most horsepower available for your 1981-1995 GM car, truck or SUV. Add up to 23 horsepower instantly with simple, plug-in installation. Only Jet Performance Chips provide exclusive, full range Dynamic Spectrum Tuning of the air and fuel ratio, ignition advance, transmission and various other parameters. Each program is track and dyno tested to ensure the most possible horsepower and drivability from each application. 50 state smog legal.