Unkown Piggyback ECU?
 

Hi guys! About 2 weeks ago i bought an old greddy build turbo miata that is running the stock ecu.
It has this Piggyback wired in. It only says JI79 and nothing else.
Is this some known unit? I Cannot find any info at all, the old owner bought it like this and said the guy who did the turbo install was an old civic turbo guy from the early early years.
https://cimg1.ibsrv.net/gimg/www.mia...bb595f381d.jpg