For example a Coyote 5 liter with the 6R80 auto trans, aftermarket ECU and a US Shift TCU. The usual problem would be getting the dash etc to work. People are doing things like putting a Nissan 370Z engine into a BMW and using Audino talking with the canbus to make it all work but that stuff is beyond me. Generally does the Xfire's electronic sensors match up pretty well with later US engines? Using a Merc V8 is not practical for my AU situation.