its not because its USDM, its because its OBDIIb, ej8 is OBDIIa and uses the red key system
if you put in the EM1 ignition lock you will have to program the keys into your immo system and ECU. and with out a red key honda cant do it without selling you a new immo set. I dont know if a lock smith can do that programming either. ( if you get stuck I can help you ). look for an immo control unit on the under dash cover ( drivers side ) . Its a black box with two connectors going to it.
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