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Well you are in luck your HF is the same wiring as the Si. Put the Si motor in using the Si intake and injectors but you need to find a PM6 ECU (90-91 ecu allow you to use chips to upgrade or even later go OBD1 yes OBD1 with a OBD0 ecu). Thats the only difference in the 2 as far a wiring. It should all be plug and play. If you use the HF ecu it will run very under powerd and lean you could possibly do damage to the motor. So get a PM6 ecu.
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Mods: D16Z6 Turbo'd P28 ecu and Greddy emanage for fuel.  FWD tire smoker
My first Civic love Died from 92 year old Fart not watchin out.
 
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