Not sure which 2001 GMC Sierra 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:
"I purchased this programmer along with a K&N FIPK Air Intake and my truck is like a rocket! Huge difference in power. I'm trying to lay off the gas so I can check my mileage, but havent't been able to yet!!!" —James B from Colorado Springs, CO bought a Hypertech Max Energy Programmer for a 2001 GMC Sierra.