Ive had cav turbo's before and id say the rst would beat the calibra turbo over the mile in the dry, due to power to weight. But not by much in my opinion.

But in the wet, and/or with some corners involved then it would definatly be a different story, and the calibra would win hands down.

And as said above, the calibra wouldnt struggle over 120 mph. They can acheive over 150 mph as standard and a 300 bhp turbo will just pull and pull to the red line, no problem.