Nearly 30 years of obsessively cataloging, photographing, and taking video of each part means it will fit your 2003 GMC Sierra Hypertech Max Energy Power Programmer - Sierra 1500 - 5.3L Engine - Gas Engine Tuner.

Period. No Hassle. GUARANTEED.

We cover round trip shipping if we make a mistake.

Check out the video below to view the Guaranteed Exact Fit process from start to finish!