I searched on reflashing or tuning the original ECU for a while and never found anyone with any proof of it actually being altered. I only ever found some box from Aussieland that replaced the factory ECU and was damn expensive I believe. There are lots of stand alone systems that can most likely run our engines just fine. MegaSquirt is what I used to run my 85 SVO, works great and has great/easy user interface. Simple to understand tags within the system, all that jazz.