Not sure which 2003 GMC Envoy 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:
"I sat for a long time and read many items about getting more power and performance. I wish I didn't hold off and waist my time! This item is QUICK TO ADD, POWER, POWER, POWER! Have not seen the rise of MPG yet but I love the extra power. I didn't think it would be a big diffrence, WOW I was floored. It's a must have GET IT TODAY. Pick up a K&H air filter and hold on 3000 rpm will pull you into the seat for little cash and supper quick to put in." —Brian D from Lafayette, IN bought a Jet Performance Module for a 2003 GMC Envoy, 4.2L 6-cyl..