The Predator 2 for is a plug and play performance programmer for Dodge and Ram diesel equipped 2500/3500/4500 trucks. Predator 2 will increase the truck performance dramatically and makes a huge difference in towing capabilities. The Predator also lets you calibrate the truck speedometer for aftermarket axle ratios or larger than stock tires, as well as remove the truck speed limiter. Get all of the power you need without even popping the hood!