![1999-2007 Classic GMC Sierra 2500/3500 6.0L and 8.1L Custom Tuning Tune Service:Traditional [$355] Black Bear Performance offers three](https://cdn.shopify.com/s/files/1/0673/0504/6304/files/BlackBearLogoFullColor_542a921c-58ab-4257-802c-bd0bda67aea8.png?v=1708631354)
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Black Bear Performance offers three different levels of custom tuning service for your 2001-2007 Chevrolet Express 4
improving fuel economy
2L engines can see up to 30hp on 91+ octane fuel
Black Bear Performance offers our AutoCal custom tuning service for your 2007-2019 GMC Sierra 2500/3500 6
High-Speed Standalone Data Logging
1999-2007 Classic GMC Sierra 2500/3500 6.0L and 8.1L Custom Tuning Tune Service:Traditional [$355] Black Bear Performance offers threeBlack Bear Performance offers three different levels of custom tuning service for your 1999 2007 GMC Sierra 6. 0L and 8. 1L. Gains vary by engine type, configuration and vehicle condition prior to the tune. 6. 0L engines will typically see a 20 35hp gain and 25 30ft lbs. 8. 1L engines will commonly see a 30 35hp gain and as much as 50 55ft lbs of torque! Power gains, combined with improved shift patterns, towing capabilities, throttle response and