Not sure which 2003 GMC Yukon Performance Chips & Programmers are right for you? We have over 7429 customer reviews, with an average rating of 4.5, to help you find exactly what you're looking for. Here's what some of our customers have said:
"Purchased the Hypertech to provide additional power in pulling a loaded 20ft. toy hauler travel trailer. Haven't pulled the trailer yet but engine doesn't feel any stronger when taking off. Gas mileage has stayed the same at 15.9. I can only hope for smoother hauling experiences this summer." —Donald F from Bridgeport, MI bought a Hypertech Max Energy Programmer for a 2003 GMC Yukon, 4.8L V8.