Engine-talk : the Ferrari uses a 3,5l. V8-engine with 400hp. (0-100km/h : 4,5sec. Topspeed 300km/h. The Porsche has a 3,6l. engine with 473hp. (0-100km/h : 3.7sec. Official topspeed : 311km/h, but Jeremy 'Poweeeer' Clarkson pushed the 997 Turbo to a topspeed of 322km/h.)
(Offtopic : Be sure to check out the awesome movie : "In Bruges", and the Clarkson DVD "Thriller".)