2007-2019 Chevrolet Silverado 2500/3500 6.0L Custom Tuning Tune Service:AutoCal Tune & Hardware [$749] 3L engines will typically see

3L engines will typically see a 15-25hp/15-20ft-lbs gain (octane dependent)

but a stock to mildly modified car can typically see up to a 25hp gain  From bone stock to heavily modified

EFILive is the best option for you

Black Bear Performance offers three different levels of custom tuning for your 1999-2000 Chevrolet Express 4

2007-2019 Chevrolet Silverado 2500/3500 6.0L Custom Tuning Tune Service:AutoCal Tune & Hardware [$749] 3L engines will typically seeBlack Bear Performance offers our AutoCal custom tuning service for your 2007 2019 Chevrolet Silverado 2500 3500 6. 0L. 20 25hp gains are common with 30 35ft lbs of torque. Significant improvements in throttle response and shift patterns. Combine that with improved towing capabilities and even fuel economy in many cases and you'll have what feels like a whole new vehicle! Additional service offerings include: VATS Delete Torque Management Modification