The new GT-2, which I've got on order, apparantly comes with either Pirelli P Zero Corsas or Michelin Pilot Sports Cups. Anyone familiar with both tires? I've used the PS Cups, which are awesome on the track. Are the Corsas also track tires, the equivalent of the Cups, but from Pirelli? If so, how do they perform relative to the Cups? Not sure if I've got a choice, but if I do, want to spec the right tires for my use.