I drive a 2004 Infiniti G35 coupe (auto) smh lol but I recently bought an engine for it with less miles and it turned out to be an 05 engine. So I was wondering what would I need in order for it to work? Cause I read something about about ecu and wiring harness needs to be the same thanks in advance

 

There's two types of engines used in the G35 coupe, as long as you get the correct one it's fine. You need the NON-rev up, you need the regular version for anything with the 5AT transmission.