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

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

improved throttle response and shifting

while running too lean may result in serious engine damage

Due to frequent issues with sensors on 6

please contact us first

Considerable Shift and Torque Converter Improvements*

If you are unable to promptly follow these directions and complete your tune

Magnacharger TVS Supercharger Pulley

No free air sensor calibration required - ever

Horsepower and torque gains along with improvements ranging from improved idle smoothness to better shift performance

Significant improvements in throttle response and shift patterns

diagnosing

0L engines can see a monster 40-50 ft-lbs of torque