I can't find a definitive answer, so thanks in advance.

Must you always replace the engine harness with a T2 S5 harness when swapping an S5 JDM T2 motor into an S5 N/A chassis ? Is it impossible, or an impossible amount of work to get the N/A harness to work?

What problems can I expect when using a USDM T2 S5 harness with a JDM S5 engine? Where is a decent place to find an intact USDM T2 harness?

Thanks.

-Sam

 

Keep your N/A harness, it is not only possible but easier that way. This swap has been done countless times, you didn't search enough.