1999-2000 Chevrolet Express 4.3L and 5.7L Custom Tuning Active Fuel Management Disable

1999-2000 Chevrolet Express 4.3L and 5.7L Custom Tuning Active Fuel Management DisableBlack Bear Performance offers three different levels of custom tuning for your 1999 2000 Chevrolet Express 4. 3L and 5. 7L. From bone stock to heavily modified, we can help your engine perform as optimally as possible. We tend to see power gains in the 10 15hp range on a 4. 3L and 15 20hp on a 5. 7L along with a 1 2mpg improvement depending on vehicle condition and configuration. Other improvements range from improved idle smoothness to better shift

We use EFILive V1 and V2 scan cables to collect data specific to your vehicle

AEM's World-famous Wideband O2 Air/Fuel UEGO (Universal Exhaust Gas Oxygen

1L engines will commonly see a 30-35hp gain and as much as 50-55ft-lbs of torque

Support & Documentation

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On-board memory allows the storage of multiple tune files and/or countless hours of logged data

Follow our detailed instructions to collect a log file from the vehicle

2L engines will typically see a 15-20hp/20-25ft-lbs on 91+ octane

Black Bear Performance offers three different levels of custom tuning service for your 2007-2008 GMC Sierra 4

The serial number can be found on the AutoCal itself as well

Please contact us for our mail-in form to include with your ECM

Copying and flashing those files takes just a few minutes