This looks promising. This looks like the right place to ask this question.

I have a (possibly) JDM engine and ecu that I (an American) bought from a Canadian "JDM import" company. I have an ecu with a really big "E6" and some other numbers and "AE831" which may or may not be helpful in identifying what car it came from. The engine code on the timing cover of the engine was EJ205DWZKE-019 (and other numbers as well)...

So I'm trying to figure out (on multiple forums, mind you) where did these things come from, did they come from the same car, and if not, how fucked am I?