Its not all about CD. Drag for downforce lowers CD. Also, isnt 17 psi a bit high for a high compression engine? Or do diablos have low conpression (9 to 1?)
I have also questioned the amount of boost quoted for a high comp motor. I believe the diablo is 10 to 1. But according to members of the Japaneese Lambo club, car makes the power, and has been reliable, although owner runs it mostly at low boost, approx 750rwhp, which is still monstrous Enzo crushing power.