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1999 GMC Sierra Performance Chips & Programmers

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Latest Customer Reviews

Hypertech Max Energy Programmer Reviews


hypertech max energy programer

Reviewed By james b (CHAPMANSBORO, TN) Reviewed for a 1999 GMC Sierra —3/12/2016 12:49 PM

dose every thing it said it would . I can really tell a difference in performance!

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Bully Dog GT Platinum Tuner (50-State Legal) Reviews


Noticable gains

Reviewed By Thomas P (BAKERSFIELD, CA) Reviewed for a 2005 GMC Sierra —12/11/2017 5:10 PM

The speed and power gains were extremely noticable. Worth the money.

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


Can tell a difference

Reviewed By damon s (HENRYVILLE, IN) Reviewed for a 2009 GMC Sierra —11/22/2017 5:50 AM

Missed out on AutoAnything $50 rebate by 4 days:(! Make sure to have battery booster just in case. Bullydog updater not compatible with Mac, took multiple attempts to get the new download to the microSD card or for the pc to recognize the card.

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