Not sure which 2003 Chevy Silverado 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:
"adds a lil power and saves a li gas but is real nice because you can adjust everything with it and see whats wrong with your car" —John F from Oak Harbor, WA bought a Superchips Flashpaq Tuner for a 2003 Chevy Silverado.
"I'm very happy with this programmer. I mainly needed a programmer to recalibrate my speedometer and as a diagnostic tool, and I bought the Hypertech because of its great value. It was definitely the right decision. Now my truck is much less willing to come out of overdrive when I use cruise control on the highway, which I am extremely happy about. Excellent product!" —Brent M from Germantown, TN bought a Hypertech Max Energy Programmer for a 2003 Chevy Silverado.
"I immediately noticed a change in power, and gas mileage. It's always nice to get better mileage, especially up here where gas is $1.15/liter." —Lyndon W from Edmonton, AB bought a Superchips Flashpaq Tuner for a 2003 Chevy Silverado.
"i have recently purchased a superchips flashpaq tuner and couldnt be more pleased. i have a 2003 silverado 1500 HD with a 6.0 and 6 inches of lift with 35 inch tires. the adjustments to correct the speedometer and adjust shifts were enough by themselves to get my attentioni but with the performance setting and the economy setting you can have decent power gains and or fuel mileage gains of up to 3.2 mpg!!" —Patrick R from Longview, WA bought a Superchips Flashpaq Tuner for a 2003 Chevy Silverado.
"My box stock Chevy 1500 has much better throttle response, Shifts better. Feels better. I first uploaded the updates... very slow going thru all the steps for optional software. Install was very easy. A little fumbling some of the steps. First installed the new gas mileage program. Gas mileage after tank fulls has stayed the same. Good power. My brother has a 2500HD. He used the power program and went from 10 to 13. My 1500 didn't see any change in power or mileage. When I checked the tire size it said 26?" versus my actual 30.5"... However police radar says my speedo was accurate before and after... I guess I'll check the internet blogs." —Arthur P from North Berwick, ME bought a Superchips Flashpaq Tuner for a 2003 Chevy Silverado.
"You just can't go wrong here... Took less than 10 minutes to install from pulling from the box to putting it back in afterwards. A lift kit and oversized tires cut back on my power and this programmer more than made up for it." —Josh C from Tuolumne, CA bought a Hypertech Max Energy Programmer for a 2003 Chevy Silverado.
"got 2003 chevy silverado 2500HD around 3 or 4 more mpg on the highway then before. Great buy easy to use. Definitely recommend this product to those in need of better gas mileage. I also use it for the tow mode, also great its like I'm not even pulling anything love it!" —Jason D from Pittsburg, KS bought a Superchips Flashpaq Tuner for a 2003 Chevy Silverado.
"Very impressed with the unit! Feel the difference right away I run on regular fuel and it's everything it says! Haven't tried the fuel coach yet but it does make a difference in fuel. I got 28 inch rims on my truck and it made up the difference and more!" —Joshua M from Gulfport, MS bought a Bully Dog Triple Dog GT Tuner (49-State Legal) for a 2003 Chevy Silverado.
"The Bully Dog Triple Dog GT Tuner has greatly improved the performance of my truck. You can really tell the increase in power and fuel economy improved by 2-3 mpg on the regular tune so i can't wait to to see how the performance tune will perform. The diagnostics have also helped me out a lot. Thanks for the great service and fast shipping." —Dustin M from Waskom, TX bought a Bully Dog Triple Dog GT Tuner (49-State Legal) for a 2003 Chevy Silverado.
"Only 2 bad things I can say: 1. Install instructions not the best, but if even if your slightly mechanically inclined it is still easy to install. 2. I can't keep my foot off the accelerator!!! The intake breathes new life into my truck. It sounds great! I even opted for the scoop as I have a Silverado SS. It really only helps on the interstate, but I do a lot of interstate travel anyway. You can really hear the motor sucking in the air and its a vast improvement over stock. The only other thing I have done to my truck so far is a performance muffler. Between the two, my MPGs have gone up 3 MPGs city and 6 MPGs highway." —Gary K C from Plainfield, IL bought a DiabloSport PC Interface - USB Cable Kit for a 2003 Chevy Silverado.
"It was easy to install and is saving me an average of 2mpg." —Jason M from Buna, TX bought a Hypertech Max Energy Programmer for a 2003 Chevy Silverado.