SKL Motorworks Performance Chip KL-PRO1 for GMC Sierra 2500 HD SLE 4WD 6.0L V8 300HP 4-speed Automatic Transmission Aftermarket Racing Performance Parts - Increase HP + Fuel Economy MPG Gas Saver SKL MOTORWORKS PERFORMANCE CHIP TUNING MODULE - for your GMC Sierra 2500 HD SLE 4WD 6.0L V8 300HP will maximize the power and economy from your vehicles engine. Increase horsepower (HP) and torque up to 20% depending on your vehicle. Fuel Economy (MPG) increase of up to 20%. Our vehicle accessories will REDUCE EMISSIONS & INCREASE HORSEPOWER! EASY AND SAFE INSTALLATION - No cutting wires of any kind or any soldering is required. Vehicle specific instructions, diagrams and pictures! FULL TECHNICAL SUPPORT! No previous mechanical knowledge required! Safe Installation! FULLY REVERSIBLE! The way our products work is by sending a continuous signal to your Factory Engine Control Module (ECM). This modifies and your factory ECM to reprogram itself for a more optimum fuel mixture and timing curve! COMPATIBILITY - Fully compatible with Automatic and Manual Transmission cars as well as Turbo and Supercharged cars! (Contact us with any specific vehicle questions.) A perfect addition to any stock or modified vehicle. Will work with modified performance cold air intake system,filters, exhaust, muffler, and headers as well as other performance and racing modifications. INCLUDED MOUNTING KIT - All installation hardware included! - Included: SKL Motorworks Performance Module, No-Cut Wire Connectors, Mounting Ties, Instructions - Most installation require no previous mechanical knowledge! WARRANTY - 100% Money Back Guarantee! - 1 Year Warranty! - All of our products are proudly backed by our 100% Money-Back Guarantee, so that means if you're not happy with our Performance Module for ANY reason at all, then simply send it back and we'll send you a FULL Refund! 30 Day Money Back Guarantee! 1 YEAR WARRANTY!