Testing was conducted on a 2011 GMC Sierra 1500 with a 5.3L gas engine in support of a Truckin' magazine article. Results are as follows: Horsepower Gains: AutoMind Super Sport 91 Peak to Peak: +8.4 HP (3.7%), AutoMind Super Sport 91 Best Gain: +10.0 HP @ 4700 rpm (4.5%), PowerPack with Super Sport 91 Peak to Peak: +18.7 HP (8.3%), PowerPack with Super Sport 91 Best Gain: +22.3 HP @ 5300 rpm (10.0%). Torque Gains: Super Sport 91 Peak to Peak: +6.4 lb-ft (2.5%), Super Sport 91 Best Gain: +11.2 lb-ft @ 4700 rpm (4.5%), PowerPack with Super Sport 91 Peak to Peak: +20.9 lb-ft (8.0%), PowerPack with Super Sport 91 Best Gain: +27.1 lb-ft @ 3300 rpm (11.4%). The AutoMind includes the following available tunes: EconomyWork/Tow (minimum 91 octane fuel required)Sport (minimum 87 octane fuel required)Super Sport (minimum 91 octane fuel required)It also includes the following advanced tuning options: Raised Rev Limit Raised Speed Limit1-2 Shift Point (adjustable in 50 RPM increments)2-3 Shift Point (adjustable in 50 RPM increments)3-4 Shift Point (adjustable in 50 RPM increments)Adjustable Fan Engagement Temperature Displacement on Demand Disable Adjustable Torque Reduction on Shift.