Stock: Choosing the Stock engine tune will result in no change to engine horsepower output. All other downloader features can still be accessed if the Stock engine tune is chosen.
Tow: This engine tune is recommended for use while towing, it is a mild tune that increases performance by 35-50 horsepower and 70-100 ft-lbs; 35 HP and 70 ft-lbs on the new 6.7L Motor. This is the only tune that we recommend you tow with other than stock.
Performance: This engine tune will yield up to 75 extra horsepower and 150 ft-lbs; 75HP and 150 ft-lbs on the new 6.7L Motor. Pyrometer and boost gauges are highly recommended while using this tune.
Extreme: This engine tune will yield up to 120 extra horsepower and 300 ft-lbs. Pyrometer and boost gauges are highly recommended while using this tune. This tune is not available for the 2007 6.7L motor.
