Grid 1.tv goes UNDER THE HOOD of the latest incarnation of an absolute classic with Porsche works driver Marc Lieb.

Behind the scenes at the first round of the World Endurance Championship at Sebring, Marc gave us a tour of one of the world's most exciting cars, the one he'll be driving in this year's American Le Mans series ... the Porsche 911 GT3 RSR…which it would seem is causing quite a stir.

Marc talks us through the improved aerodynamics and other changes to the car which he hopes will help him secure victories in 2012.