Of course you want maximum power and mileage from your Chevy truck. But in order to get there the engine has to breathe The Banks PowerPack optimizes and manages engine airflow from start to finish in one beautifully engineered package. Featuring bolt - on and direct - replacement components, PowerPack greatly enhances horsepower, torque, durability, efficiency as well as that authoritative exhaust sound you want out of your truck. And with Banks longevity is never a concern. Our exhaust systems and TorqueTube manifolds are constructed of top - quality 409 stainless steel providing not only a beautiful but also durable finish Optimizes airflow, air density, continuous power, durability and MPG. Not available for every Chevy truck - call for details. 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 w Super Sport 91 Peak to Peak 18.7 HP (8.3), PowerPack w 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 w Super Sport 91 Peak to Peak 20.9 lb - ft (8.0), PowerPack w Super Sport 91 Best Gain 27.1 lb - ft 3300 rpm (11.4). The AutoMind includes the following available tunes Economy WorkTow (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 Limit 1 - 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.