Rawze.com: Rawze's ISX Technical Discussion and more

makes the emission system a bit more lenient, reduce some egr to save the engine, disable the shutdowns that will put you at 5mph and on a hook. some of the things ive heard of for compliant tunes. big thing is though if your engine starts throwing codes that would normally cause a shutdown you need to get to a safe place ASAP and fix it as with the shutdowns off you can destroy your engine that much easier with plugged up exhaust.

ok, so where do you get the manual for doing that?

From the minds of the pros knowing which setting to tweak this way and that way. Rawze, Unilever's, momaburt, gearhead maybe a couple of other members.