Ok, I didnt even know how to search for it, but I read the faq and didnt see it covered.

When you get custom tuned, does the tuning ever expire or change or whatnot and need to be re-tuned? Does the car's pcm or whatever tend to recalibrate and screw up the tuning you guys do when you use efi life and the others?

Thanks L

 

If it's done right, it should be good until you significantly change something mechanically or something mechanically fails.