Not sure which 2004 GMC Sierra Power Programmers & Performance Tuners are right for you? We have over 5642 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:
"I have tried all modes except tow mode. I was unimpressed with both 87 octane and mileage saver. I however am very impressed with 91 performance. It gives you the most power while giving you the best MPG increase! Will recommended to everyone i know!" —Thomas B from Lake Villa, IL bought a Superchips Flashpaq Tuner for a 2004 GMC Sierra, 5.3L V8.
"so far this tuner is pretty cool. has a lot of adjustments that the user can make on their own or do the datalogging and get help from tech support." —Joseph L from Marksville, LA bought a DiabloSport inTune I-1000 Tuner for a 2004 GMC Sierra, 5.3L V8.
"Awesome! State police said "I wish my police car could accelerate like this." Haven't used the tow setting yet, but with the performance results I got, I have no doubts it will be awesome too." —John Jeremy B from Las Cruces, NM bought a Superchips Flashpaq Tuner for a 2004 GMC Sierra.
"Easy to install.
I'm a watch the video type guy...(i hate to read..especially small print)
I wish the had a library on YouTube of how and what the fine tune adjustments will and will not do to performance or gas milage.
I do like the the performance on 92 octane.. Wow!" —Joe L from Lakeside, CA bought a DiabloSport Trinity T-1000 Programmer for a 2004 GMC Sierra, 5.3L V8.
"Setup is easy and quick, cool and fast way to improve performance to my 5.3 sierra. I like that it has the engine load and throttle position on display if you want to have it on while you drive. I would recomend for it for someone who wants to do a quick tune to their truck" —Victor C from Pasadena, TX bought a Superchips Cortex Programmer for a 2004 GMC Sierra.
"took 20 minutes to get it right...really opened up the power on the 4.8 GMC PU 2004
burns less fuel now and wish I had bought it when I first got the pickup." —Ray G from Murdo, SD bought a Superchips Flashpaq Tuner for a 2004 GMC Sierra, 4.8L V8.
"Running this with my K&N FIPK intake I also got on autoanything.com my truck went from 13 to 17 in the city and 17 to 21 on the highway running on the performance setting with premium gas. It also gave my truck a lot more acceleration by changing my shift points. The most power it noticed in 3rd gear." —Brandon C from Gaylord, MI bought a Bully Dog Triple Dog GT Tuner (49-State Legal) for a 2004 GMC Sierra.
"The bully dog tuner worked very well with my 3 inch front to back dual exhaust and cold air intake. The power increase was substantial and the milage on my first 70 mile trip was 18 mpg which is impressive for an 3/4 ton 4 door 6.0 truck. I could not get the shift points to work on performance or tow without hitting the rev limiter so I had to leave the download on stock, that was the only problem I had." —David W from Cody, WY bought a Bully Dog Triple Dog GT Tuner (49-State Legal) for a 2004 GMC Sierra, 2500, 6.0L V8.
"I have only used the chip in tow mode. It really did wonders to help give my 5.3 GMC the extra boost i needed to get up the steep hills while towing my 6000 lb camper." —Edward H from Statesville, NC bought a Superchips Flashpaq Tuner for a 2004 GMC Sierra, 8.1L V8.
"My truck is an '04 GMC Serra w/ 6.0 gas engine,auto tran w/4.10 gears in rear. Highway gas mileage was 14 to 15 mpg as long as I kept it at or below 60 mph. First trip w/GT was 75 mile round trip over two lane black-top roads w/ speed limits of 55 & 60. It got 18 mpg. I didn't run performance test, but it seems to have more power. Can't wait to see how much better it pulls my 5th wheel camper." —Harold G from Washington, MO bought a Bully Dog Triple Dog GT Tuner (49-State Legal) for a 2004 GMC Sierra, 2500, 6.0L V8.
"bought this for my 2004 gmc 1500 4x4, very happy,mpg went from 15 city to 17.5 ! and 19mpg hwy, and performance WOW didnt know my old truck would run like that. WOW!" —Richard M from Valley Grande, AL bought a Superchips Cortex Programmer for a 2004 GMC Sierra, 5.3L V8.