Not sure which 2004 Chevy Silverado 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:
"Have the Unit in performance mode and seems to have made a difference. A friend with same truck but but a 5.3 drove my truck and ws very impressed. going to try mileage mode soon as i'm going on trip. But you can't go wrong with the Cortex." —Gregory N from Cochranton, PA bought a Superchips Cortex Programmer for a 2004 Chevy Silverado, 4.8L V8.
"I put this on my 4.8L, 4x4, 5 speed manual, 04 Chevy Silverado. It is a great compliment to my K & N cold air induction kit! Definitely removed any resistance in the gas pedal. I can do 0-60 in around 7 seconds now. Not bad!!" —Henry B from Anderson, IN bought an Edge CS Evolution Programmer for a 2004 Chevy Silverado.
"We were so happy with the performance of our 1st Hypertech unit on our '03 GMC DuraMax that I ordered another one the very day I bought a 'new to me' '04 Silverado DuraMax last month. The improvement in fuel mileage and horsepower exceeded expectations. AutoAnything Customer Service Dept was easily as amazing as the product. Thanks for everything!" —Denise K from Elburn, IL bought a Hypertech Max Energy Programmer for a 2004 Chevy Silverado, 6.6L Duramax.
"I programmed my Superchip to the performance mode and not only got more power but also am getting better gas mileage. I have only ran one tank through it so far but am very pleased." —Jeff B from Blossom, TX bought a Superchips Flashpaq Tuner for a 2004 Chevy Silverado.
"Definitely a good purchase. Should have bought it sooner.
Along with increased power, and nicer trans shifts, I drive about 300 miles a week and am now saving $10 on gas because i am getting 18mpg average (04silverado 1500 w/4.8) with back road route!" —Diana G from Newton, NJ bought a Bully Dog Triple Dog GT Tuner (49-State Legal) for a 2004 Chevy Silverado, 1500, 4.8L V8.
"Increase in milage and performance! It will surely pay for itself in short order. Money saved will go to the tire shop though!" —Rodney R from Lander , WY bought a Bully Dog Triple Dog GT Tuner (49-State Legal) for a 2004 Chevy Silverado.
"This was my first time ever using a chip and I am really impressed. The truck has obvious reaction changes to the different settings used. Adds a lot more power than I expected as well. Overall, it was definitely worth it." —Damian H from Bloomer, WI bought a Superchips Cortex Programmer for a 2004 Chevy Silverado.
"Just got it to compensate for my 6" lift but it offered so much more than expected. The power difference is huge now I can show real power when I need it the most." —Adam S from Hermiston , OR bought an Edge CTS Evolution Programmer for a 2004 Chevy Silverado.
"After comparing several of the tuners I settled on the Cortex from Superchip. It is super easy to install and I have noticed my mileage improved from mid 14's to high 16's mpg. I also added a K&N air filter. I will try the trailer hauling mode in the next few weeks. I travel 200 miles each way to our farm in central Kansas to hunt turkeys and deer. I pull a trailer with a Kawaski Mule back and forth. The trailer and mule weigh about 2500 lbs. I am excited to see how much it helps with pulling my trailer. Your people were very helpful and knowledgeable. Thanks for your help, I will order from AutoAnything again." —Richard B from Burlingame, KS bought a Superchips Cortex Programmer for a 2004 Chevy Silverado, 5.3L V8.
"So far I have had it on my truck for a little over 2 weeks. gains 2 mpg if I keep my foot out of it. but it really did make the truck come alive. it even gives u a small smoke cloud if u turn it all the way up. love it so far." —John C from Clarksville, MO bought a Superchips Flashpaq Tuner for a 2004 Chevy Silverado, 6.6L Duramax LB7 (8th digit in VIN = 1).
"I purchased this programmer for 1 reason..... to get better fuel mileage. I was getting 11 around town. Got the programmer and it is now up to 13.38. I am very happy with my purchase. The programmer is doing just what it said it would do!! Very easy installation. Took less than 10 minutes. The hypertech max energy programmer is a must have if your looking to increase your fuel mileage!!" —Zachery E from Asbury, NJ bought a Hypertech Max Energy E-CON for a 2004 Chevy Silverado, 6.0L V8.