For the cost of a C-Box nowadays one used to be able to purchase about 40 trikes!!!! (this according to a popular Southern Africa Rotax distributor)
For the E - they probably ran out of space for the digits
Guys, this will only get worse. Follow the Jabiru way. You'll save gazillions
in fuel, in maintenance as well as in purchase. Rotax is total madness with
their prices.