Silverado 5.3L V8 Performance Programmer

Unlock the hidden potential of your 5.3L V8. This handheld tuner plugs into your OBDII port and allows you to upload pre-loaded performance tunes. The 'Performance' tune adds up to 20 HP and 25 lb-ft of torque by optimizing timing and fuel curves. The 'Economy' tune adjusts shift points to maximize MPG on the highway. Also allows you to adjust the speedometer for larger tires, change the top speed limiter, and disable the Active Fuel Management (AFM/DOD) V4 mode that many drivers dislike.