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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 Power Programmer

Reviewed By Richie F (FARMINGDALE, NY) Reviewed for a 1999 GMC Sierra —3/11/2014 8:57 AM

I have a 99 Sierra short bed, Cold air intake, throttle body spacer, Magna flow cat back and 33 inch tires and rims. Your product really Woke my truck up,also took care of tire ,speedometer and shifting issues I would let you know about the gas mileage but I can't keep my foot off the accelerator. This is a Great product and your service was excellent

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Superchips Flashpaq Tuner Reviews


Reviewed By german b (SCOTTSDALE, AZ) Reviewed for a 1999 GMC Sierra —3/6/2014 9:14 AM

Once i install it into my truck right away i notice the difference on my rpm's.

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Hypertech Max Energy E-CON Reviews

max energy e-con

Reviewed By william b (Holland, MI) Reviewed for a 1999 GMC Sierra —3/23/2011 6:41 AM

the trans shifts are great for part throttle as is full throttle. gas mileage has yet to be know as no fillup as of yet .easy to install once downloaded .

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