Mopar "Crate Hemi Engine Kit"

Based on my understanding, at least on the earlier 5.7 crate kits, the ECU was basically just a generic AEM ECU with 5.7 settings preinstalled. The harness was also tailored for the car. You could buy the generic stuff from AEM, though you would have to terminate the harness yourself and do all the ECU setup. It's not necessarily that hard, but it's probably worth the price of convenience to get it from Mopar already done.