Yeah how about one VIN before mine to one VIN after mine?That seems like a very arbitrary date? Why not everyone with MCU1 as MCU2 can retrofitted on any MCU1, regardless of date manf. date.
in all seriousness though I would pay for a MCU2 retrofit without a second thought. It takes 2 minutes to plot a 300 mile route on MCU1 and MCU2 does it in 5 seconds. Driving blind for a mile or two is really an annoying way to start road trips.