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2003 GMC Sierra Power Programmers & Performance Tuners

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Latest Customer Reviews

Edge CTS Evolution Programmer Reviews

03 gmc sierra 2500hd diesel-6.6liter

Reviewed By matt f (SINKING SPRING, PA) Reviewed for a 2003 GMC Sierra —6/28/2013 10:04 AM

I'm from sinking spring pa, I ordered the cts on Thursday and received it Friday afternoon. Definitely great shipping. Installation was very easy, had a slight problem getting it to program my truck but called tech support and they instructed me very clearly what to do, followed their instructions and plugged unit back into my truck, followed the prompts and within minutes I was on the road. I currently keep it on the third power level, 18mpg round town, and pushing 24mpg highway

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Superchips Cortex Programmer Reviews

power program

Reviewed By Pat S (Santa Cruz, CA) Reviewed for a 2003 GMC Sierra —7/18/2012 12:03 PM

Programmer was easy to install takes about 3-4 min power you can feel when on freeway but dont feel in low end tourque. shift point much firmer. still waiting to see my gas milage go up other reviews say gas milage went up with performance tune to 16-17 mpg but still reads 15.1 AVERAGE mpg maybe 87 tune will do the trick.

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DiabloSport inTune I-1000 Tuner Reviews

Great Purchase

Reviewed By Denny S (Denair, CA) Reviewed for a 2003 GMC Sierra —6/25/2012 5:54 PM

The DIABLOSPORT INTUNE is a great purchase. I do see a difference in my truck and do recommend it too others. I would like to have more variety of tunes though. Other than that, it gives no problems and does great.

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