Not sure which 2003 Ford Mustang In-Line Modules are right for you? We have over 945 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:
"Pretty good buy. Chip works pretty good. Stiffer acceleration and smoother gear shifts" —Joseph A from Ormond Beach, FL bought a Jet Performance Module for a 2003 Ford Mustang.