Not sure which 2005 GMC Sierra Power Programmers & Performance Tuners are right for you? We have over 2568 customer reviews, with an average rating of 4.5, to help you find exactly what you're looking for. Here's what some of our customers have said:
"Just minutes to install, installed with K&N kit and really brought my truck to life, lot more towing power and a little bit of a mpg gain to boot." —Chris O from Sawyer, ND bought a Hypertech Max Energy Programmer for a 2005 GMC Sierra.
"... auto tranny w/4.1:1 14 bolt rear end. I haven't used all the features but I tried the power programming and like the way my truck runs on the high octane setting. Noticeably more pep. Only slight increase in fuel mileage around town, about .5 mpg. 2 mpg gain on hwy though which is a pretty good percentage since I only get 14-15 hwy anyway. Was alsoable to dail in the speedo/odo. Pretty good product but will eventually want one that shows gauges and allows adjustments on the fly..." —Donald B from Chehalis, WA bought a Hypertech Max Energy Programmer for a 2005 GMC Sierra.
"Wish I'd done this years ago. I will buy one of these programers for each car I buy for now on!! This unit changed by PCM mapping for better fuel economy, but it actually gets better mileage in Performance mode! My truck went from 14.5 mpg to 18.1. That alone was worth the expense, but the performance was an added bonus. I had already been happy with my full exhaust and cold air intake, but this was the icing on the cake. Buy one, you won't regret it. Very easy to use too." —James A from Albuquerque, NM bought a Superchips Cortex Programmer for a 2005 GMC Sierra.
"It is very easy to use. The directions in the box are very vague. I called superchip for clarification. I drove on a 250 mile trip on the Economy setting and saw no improvement in mileage. I have proceeded to the next setting and hopefully will see better results. It dose seem to have better throttle response. Hopefully mileage will improve." —Tom L from Logan, OH bought a Superchips Flashpaq Tuner for a 2005 GMC Sierra.
"I bought the Superchip to help increase the mileadge I get with my GMC 2500HD Duramax Diesel. I am getting about 2 to 3 miles more per gallon when driving 65mph." —Stewart G from King, WI bought a Superchips Flashpaq Tuner for a 2005 GMC Sierra.