2001-2007 Chevrolet Express 4.8L, 5.3L, 6.0L and 8.1L Custom Tuning Tune Service:AutoCal Tune & Hardware [$749] 1L engines can see a

1L engines can see a monster 50+ ft-lbs of torque

We tend to see power gains in the 15-20hp range on a 5

20-25hp gains are common with 30-35ft-lbs of torque

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2001-2007 Chevrolet Express 4.8L, 5.3L, 6.0L and 8.1L Custom Tuning Tune Service:AutoCal Tune & Hardware [$749] 1L engines can see aBlack Bear Performance offers three different levels of custom tuning service for your 2001 2007 Chevrolet Express 4. 8L, 5. 3L, 6. 0L, and 8. 1L. We commonly see gains of 15 30hp, 15 20ft lbs of torque gains out of the 4. 8L 5. 3L variations and 6. 0L 8. 1L engines can see a monster 30 35hp+, 40+ ft lbs of torque, depending on fuel quality, octane and vehicle condition prior to the tune. Due to frequent issues with 6. 0L and 8. 1L vehicle sensors, we