Not sure which 2003 Ford F-350 Performance Chips & Programmers are right for you? We have over 7429 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 just recently installed the program on my wife's car.I noticed a difference right from the start. Power increased but i did notice a strange sound coming from the engine compartment during acceleration. I think it was coming from the stock breather assembly. I switched it to econo and drove it on a 2000 mile trip for a vacation. During the trip I notice an average increase of 2 to 3 miles per gallon. Not to bad for a gas hog dodge Hemi. The only dissapointment was the long download cycle. Overall I am very impressed with the product." —John L from Orange Park, FL bought a Superchips Cortex Programmer for a 2003 Ford F-350, 5.7L Hemi.