The main goal for the 2010 Porsche 911 GT3 R isn't more performance, it's drivability and "easier" handling, two thing the GT3 Cup S it replaces wasn't known for. Also, it's got a ginormous rear wing.
Intended for competition in the international GT3 class, the R does bring more performance too. The engine size is up .2 liters to 4.0, bringing with it a power increase to 480 HP, 30 more than the road car. The whole thing weighs just 2,646 Lbs, making the 3,031 Lbs 2010 Porsche 911 GT3 RS look positively fat.