ok i have a 99 civic ex with a Jdm b18c sir-g engine swap... right now i have the p72 obd2a ecu and im looking into buying a obd1 ecu for tuning purposes...what is the best obd1 ecu i should get for my set up and if it matters im planning on running a hondata s300 as well?

 

you can use P30-a, P28, P72 with hondata s300

 

You can use a variation of obd1 ecus. Since your running an obd2 vehicle, you will need an obd2 to obd1 jumper harness or a hondata s300 obd2 bundle package which allows you to plug & play an obd1 hondata s300 ecu into your obd2 vehicle.

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