Not sure which 2008 Chevy HHR 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 have a k&n air box a jet mass flow air sensor and magnaflow exhaust on a 2.4 hhr I just put the stage 2 chip . these guys should have written the original code from GM my car runs way smoother with chip exhaust is not over loud because GM code has it in wrong gear or wrong air or fuel flow. I have great response lots of power and a mutch more even way to distribute that power . And my gas milage has jumped up I do not have numbers but I would say at least 2-3 miles more per gallon. That is if you can keep foot off of pedal" —Kurt L from Novi, MI bought a Jet Performance Module for a 2008 Chevy HHR, Automatic, 2.4L 4-cyl. engine.