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2003 GMC Sierra Performance Chips & Programmers

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Latest Customer Reviews

Bully Dog GT Platinum Tuner 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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Hypertech Max Energy Programmer Reviews

Hypertech programmer is a quality product.

Reviewed By Gary R (CASPER, WY) Reviewed for a 2003 GMC Sierra —3/29/2015 4:58 PM

Easy to set up. Easy to program vehicle. Better acceleration; better power; some increase in MPG. Almost like having a new truck.

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DiabloSport Predator P2 Tuner Reviews

Good Unit

Reviewed By Kenneth P (East Carbon, UT) Reviewed for a 2003 GMC Sierra —6/19/2011 6:48 PM

The DiabloSport tuner did exactly what they said it would do with the performance tunes. It really made a difference in the performance of my 6.6 Duramax. However I have experienced a problem where certain tunes have caused a buzzing noise coming from the dash after a tune is put into the computer, still waiting on a solution.

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