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Message: [QUOTE="Dzlnut, post: 441615, member: 394"] I had some questions on this so I dug this up... Street: This is used for general performance increase and is more conservative than the performance file. It will give a significant power gain over stock, but still safe enough for towing small loads. Performance: This is the most aggressive file. It can be used for street and racing. It will usually give better fuel economy than street or tow, but cannot be used to tow as EGTs may become dangerously high causing damage to the engine and other components. Towing: This file should be used when towing any significant loads. It has more power than stock, but less than the other files to prevent breakage. It also has changes to the shift schedule to aid in towing and keeping trans temps down. Jake Brake: This is used as an exhaust brake to increase engine braking while coasting towing heavier loads. It will help lower brake temperatures as well when towing over steep grades. Locked at CT: This will keep the torque converter clutch locked during decell. to aid in engine braking. This is less aggressive than the Jake Brake file so it may be ideal for smaller loads. It can be used in conjunction with the Jake Brake as well. Aggressive Tow-Haul: This file will give a more aggressive shift schedule helping keep the engine in its power band longer while towing. This will also aid in engine braking as well. Lock in 1-2-3: This is mainly useful for drag racing. It will transfer more useable power to the transmission after the vehicle is moving. It will also aid in engine breaking as well as slight fuel economy improvements. Raised Shift Points: This will raise the MPH that the transmission shifts putting it closer to its power band. This may not be ideal in all situations. Shift Firmer: This will increase the firmness of the shifts above what it is already tuned with. Shift Points at WOT: This is the speed in MPH above (+) or below (-) that the vehicle will shift to the next gear at wide open throttle (WOT). These adjustments will be made to the current tune. Shift Pressure: This is a percentage change to the transmission fluid pressure above (+=firmer) or below (-=softer) that the transmission will shift at. This controls how firm the shifts will feel. These adjustments will be made to the current tune. Notes: Shift Point Up / Down does not apply on manual transmissions. [/QUOTE]