Innovative Performance Chip/Power Programmer for GMC Envoy 4.2L and 5.3L - Improve Your Fuel Mileage, Save Gas & Gain More MPG, Increase Horsepower & Torque with this Engine Tuner! Boost your GMC Envoy's horsepower, torque, throttle response and fuel economy with the advanced Innovative Performance Chip! Safely gain up to +35 HP and up to +5 MPG in fuel mileage in your GMC Envoy by safely optimizing your air/fuel ratio and timing curve for increased efficiency! Easily installs in less than 15 minutes, with absolutely no mechanical experience required! All GMC Envoy performance chips come with an installation kit, including detailed installation instructions with easy to follow step-by-step pictures! Our award-winning 5 star technical staff is here to guide you and help with any questions that you may have. Makes NO permanent changes to your GMC Envoy's computer! It will not void your GMC factory warranty, and it's completely emissions safe. The performance chip is fully compatible with all trims, including (but not limited to) Denali, Envoy XL, Envoy XUV, SLE, SLT, XL Denali, XL SLE, XL SLT, XUV SLE and XUV SLT models with 4.2L and 5.3L engines. We strived to create the most high quality product in every aspect, delivering you the most affordable product without sacrificing quality. All GMC Envoy performance chips feature a high-end aluminum enclosure with an extremely durable, high quality anodized finish. It's a thousand tiny details that add up to something big. All GMC Envoy performance chips are proudly backed by our unmatched 100% Money-Back Guarantee & Lifetime Warranty! A properly maintained vehicle is required for the performance chip to function as intended and advertised. Results may vary.