Crazy Larry, pedophile Larry etc, only really work on the 04.5 and 05 cummins truck. Even though it says you are loading crazy larry, it dosent actually change anything, it is just the regular extreme.
I agree with Preacher though, nothing works better on a duramax than EFI Live, with PPE being a close second. PPE just knows duramax.
so you're trying to tell me that Crazy Larry doesn't add any extra power to an 06-07 5.9?