Not sure which 2007 Hummer H3 Performance Chips & Programmers are right for you? We have over 3535 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:
"HP obviously has increased as well as smoother shifting. Not sure about MPG yet, but will assume with the small advance in HP, MPG should be slightly better. I'm disappointed the unit went on sale and had a $20 mail in rebate after my purchase, but I'm still happy with the price. This is the first (real)PCM I've seen for the Hummer H3. Great service and prompt shipping." —Robert N from Evansville, IN bought a Jet Performance Module for a 2007 Hummer H3.