For info the M3W ECUs were fully locked after 2017 as part of the EU4 regulations and as I understand it even MMC didn't have unlock codes for these.
Garage 56 and M3WServices offer a mappable Emerald ECU which comes with a tried and tested M3W map.
I did drive the KH Stage 3 development car with the big bore engine and an estimated 120 -125 bhp. In the dry on warmed up tyres it readily span it's back wheel in third and whilst a hoot to drive I would be very very nervous of using something like that on a cold, wet winter's day!
!
