I've tried calling greddy and no one ever answers:

I was wondering if a 99-00 civic si blue box would work with my del sol vtec (b16a3), I didnt know if they were OBD specific

 

not sure i know certain kits come with different units because of different motors. If no one here answers call them again, they always answer my calls right away so keep trying. and if you need a blue box unit i am selling mine.