Not sure which 2004 Mazda 6 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:
"Great product, performance is just as posted. Good quality product. I noticed immediate power gain upon installation.
On the downside the mounting instructions were useless, the unit will not mount as described/with mounting materials provided. Also the CEL light will come on unless using 93 octane gas." —Mcclaren J from Mechanicsville, VA bought an Unichip Performance Chip for a 2004 Mazda 6.