I have a 03 Civic SI ECU... with Hondata Kpro you can use this ECU on any K-series motor. If you want to use this OEM ECU on your SI, you will need to have the immobilizer reprogramed at your local Honda dealership to work on your SI.

I'm looking to get $150 + shipping. If you're local, we can meet somewhere in the Puget Sound area. IM me!