911 GT2 RS shows it prowess on the track compared to base Carrera. GT2 RS particularly strong on the long sprint to 150 mph (241 km/h).
http://www.youtube.com/v/ICdeyDs73pY?fs=1&hl=en_US
Porsche 911 GT2 RS vs Porsche 911 Carrera (http://feeds.worldcarfans.com/~r/worldcarfans/Jxfz/~3/Cajt6E3yPuc/porsche-911-gt2-rs-vs-porsche-911-carrera---worth-the-price)