Ej and Fa Ecu??

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What's up guys, so I've been contemplating over this question for awhile, and I've come up blank. So let's say for instance you had a engine control unit for a ej20 whats stopping you from pairing that with a  fa20 engine? Would it be different map parameters or what?? I mean emission wise it should theoretically be the same right??
 
Differences between Subaru EJ20 and FA20 engines





These are completely different systems. Port Injection vs Direct Injection

Different PCM
Different wiring harness
Different fuel system
Different fuel management system
Different emissions systems

You're Welcome.
 

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