The FXX is based on the street-legal Enzo. The FXX uses some technology developed from the Enzo, and combines it with some new developments from Ferrari and its suppliers. However, the car is only a part of the overall program. Customers pay $1.8 million, but are only allowed to drive the car on special track days which are approved by Ferrari. After they drive the car, the owners are entitled to be briefed by Ferrari on the car's performance. Ferrari's sister company, Maserati, has developed a similar car, the MC12 Corsa. An evolution of the Enzo, in essence, the FXX shares some components with the original car, but numerous, significant developments are unique to the FXX. Ferrari has built 30, adding one special edition to the 29 that were originally planned. The original 29 have all been sold to pre-selected past Ferrari customers. The 30th was retained by Ferrari S.p.A. and presented to Ferrari's F1 World Champion driver, Michael Schumacher, when he retired from Formula One racing at the end of 2006. Schumacher's FXX differs from others in being black without a stripe, having red trimmed wheels, matte rather than chrome exhaust tips, and his personal logo stitched on the racing seats.