SLP Programmer, 2007-08 5.3/6.0 Express Van Handheld SLP Custom Tuned DiabloSport II .

Looking for the most powerful PCM-tuning tool on the market? Unlike typical off-the-shelf programmers, the DiabloSport II by SLP comes armed with an ultra-hot custom tune developed specifically for your vehicle application. Through extensive testing on our in-house dynamometer, our engineers were able to determine the precise levels of spark and fuel required to achieve optimal horsepower and torque at each rpm increment. Our 6.0 Sierra test truck gained over 40 RWHP with DiabloSport II tuning alone! In addition to its dyno-proven performance programming, this portable, easy-to-use unit DOES NOT allow you to adjust parameters, the programmer is locked for 50 state-emissions-legality yet still retains the same horsepower benefits as our non-California programmer.