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2003 GMC Sierra Performance Chips & Programmers

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Latest Customer Reviews

DiabloSport inTune i2 Tuner Reviews


Great Tuner!

Reviewed By Scott R (SAINT PETERS, MO) Reviewed for a 2003 GMC Sierra —3/17/2016 8:55 AM

This tuner works great and is very fast and easy to change settings on my truck. Feels like a totally different vehicle now.

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Bully Dog Triple Dog GT Tuner (49-State Legal) Reviews


bully dog rating

Reviewed By Tim B (CORINNE, UT) Reviewed for a 2003 GMC Sierra —2/24/2016 5:28 AM

i would have thought that you could adjust between performance , towing ect. without redoing the whole set up. other than that i am completely satisfied.

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DiabloSport Trinity T-1000 Programmer Reviews


The Devil made me do it, enhance my truck's performance, that is

Reviewed By james S (RIVERVIEW, FL) Reviewed for a 2003 GMC Sierra —9/10/2015 1:49 PM

This is my first foray into Tuning, but with this product, and a little research its point and click. Installation/use was easy, and tunes can be modded as you go. Easy to read, easy to navigate, easy to use (to a certain point, for a novice). And fun. You notice the differences in performance right away.

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