Originally Posted by ImpetuousRacer
May be dumb question. Buy new OEM ECU, tune it, replace your OEM with it. Warranty time, swap ECU?
Won't work as your EWS will be miss-aligned (ie car won't start) and plenty of other things won't work and throw errors etc (mileage, modules, VIN etc)
Replacing the DME is not an exercise you want to try at home