The best handheld tuner on the market, the Quadzilla Stealth 2 Power Programmer is a second-generation vehicle tuner that offers the upgrades you need to get the power you crave.

Custom-built to your particular Duramax or gas GM engine, this handheld tuner provides a host of performance upgrades. Diesel users will add up to 135 horsepower and 300 ft. lbs. of torque while also seeing fuel efficiency increases. The Quadzilla Stealth 2 Programmer also coaxes extra horsepower and torque out of gas engines and provides a variety of system adjustments. You can reset your transmission, get real time data, remove your top speed limiter, and get true speed readings with over-sized tires. Update your software regularly via the USB port and keep your engine's performance up-to-date and running at full power potential.

Take control of your engine with a Quadzilla Stealth II Power Programmer and get the power gains you need. Backed by a 1-Year Warranty.

Note: In California, this product is legal only for racing vehicles that will never be used on public highways.