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1999 GMC Sierra Gas Saving Products

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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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Flowmaster Exhaust Systems Reviews


Reviewed By PAUL C (Crestview, FL) Reviewed for a 1999 GMC Sierra —2/26/2012 5:35 AM

My truck has gone from some meek, muffled 5.3L 99 GMC Sierra to "holy cow can you believe the sound of that thing!" Nice...NICE rumble on cold crank and smooth on idle. Exactly what you want. Inside, the high RPM, low gear tone can get defening for a SHORT time. Under power...hoo boy...nice baby. Cruising speeds, hardly notice it at all and that's what I was looking for. Big bang in town, nice and sweet on the highway. Get this system.

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