i am going to guess way different than all of you and say that the motor will be a de-compressed version of the gallardo v-10 so that with the boost is a daily driveable easily tuned and somewhat reliable 500 hp at 8.5psi and will introduce a newer version or a bosch motronic system that will make the drive by wire slightly more tollerable. is that too specific for anyone to believe it is just a guess?
anyone saying that a number like 550 as a conservative guess is silly. audi always dissapoints with thier hp numbers. tq curves however, tq curves never sem to dissapoint.