Not sure which 2003 Nissan Altima Performance Chips & Programmers are right for you? We have over 744 customer reviews, with an average rating of 4.5, to help you find exactly what you're looking for. Matthew B from Katy, TX said, "Lets see....I installed a flowmaster 40 series muffler and an AFE cold air intake and saw some significant improvements. Only problem was after I installed the AFE kit my idle rev was almost at a stall. I installed the flashpaq tuner and this issue was alleviated. The tuner also made the shifts much smoother. Obviously my truck is still a "truck" but its fast and pulls hard all the way to 100. I smoked a Dodge 5.9L R/T!! JBA headers are going on next week. Its not a cheap item, but the fact that you can grow with the tuners downloadable features is a huge plus. I would buy it again."
Year Range For Nissan Altima Performance Chips & Programmers