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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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DiabloSport inTune I-1000 Tuner Reviews

Pretty good tuner

Reviewed By Thomas J (JENKINS, KY) Reviewed for a 2013 GMC Sierra —7/18/2015 9:13 AM

Truck feels much better after turning AFM and torque management off. Took a few days to really notice. Installed the 93 "hot tune" as well. Don't expect smoking burnouts or a Camero killer but the truck does feel better to drive. I recommend it just for the fact that you can turn off the factory restrictions and AFM, but for straight up power gains I recommend a custom tune. That's my next route.

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