1999-2007 Classic GMC Sierra 1500 4.3L, 4.8L, 5.3L and 6.0L Custom Tuning

Black Bear Performance offers three different levels of custom tuning service for your 1999-2007 GMC Sierra 4.3L, 4.8L, 5.3L and 6.0L (Including Sierra Denali!). Gains vary widely by engine type and configuration. 4.3L engines will typically see a 10-15hp gain 4.8L and 5.3L engines will typically see a 15-25hp gain. 6.0L will see a 25-30hp gain on 91+ octane! Power gains, combined with improved shift patterns, towing capabilities, throttle response and even fuel economy in many cases and you'll have what feels like a whole new vehicle! Additional service offerings include: Speed and Rev Limiter Increase Efan enable Torque Management Modification/Removal Tire/Gear Change Calibration Accommodation of Most Modifications (Internal engine modifications, superchargers, turbochargers*, upgraded transmissions, etc). *Due to variability in turbocharger systems, they must be evaluated by our tuner prior to committing to any services.  Additional tuning service/hardware may be required.