Just to throw another variable in which I havnt seen mentioned in this thread , when I did the stage 2 Morgan upgrade , it came with an unlocked ECU letting me , and the tuner I used tweak it futher as required.
I suspect , and have never read otherwise, all Morgan staged upgrade ECU's are supplied open.
I have no idea if third party ECU's do this, worth checking before purchase.
Its possible they could load their map then lock it.
