Adding horsepower to your Sierra or Silverado HD truck has never been easier! The Predator 7203 for Duramax Diesel trucks can add over 100 horsepower in minutes! With this simple plug and play performance tuner, your truck will get more power for towing, better fuel economy, and will feel better than the day you bought it! With the Predator, you can also change some key options in your truck like setting the speedometer up for aftermarket axle ratios or larger aftermarket tires, and you can remove the top speed limiter! The Predator is the easiest performance upgrade you can do for your truck, with the best performance gains for the money!