I think being slightly slower than 911 Turbo means nothing. Just imagine if R8 would be 0.2 sec or so faster with it's n/a engine versus turbo. Porsche needs only the cheapest chip and things shift round immediately. It is silly to argue about straight line acceleration times between these two cars, not to mention that R8 is so much closer to GT-3 RS or Ferrari 430 than Turbo...It is a track oriented car, while Turbo is better in everyday use, and also faster.