This is an absolutely fascinating video posted by Drive on YouTube. They got an exclusive inside look at the Audi Le Mans racing program as they tested their new 2012 cars at Sebring. Audi will be fielding two cars this year, the R18 E-Tron Quattro and the R18 Ultra. Both cars use a V6 direct injection diesel engine to drive the rear axle. The only difference is that the E-Tron Quattro also has an electric motor that drives the front axle. For energy storage, the E-Tron is using the magnetic flywheel system that Porsche has been developing with the Williams F1 team in their 911 GT3 RS Hybrid endurance racer. Drive does an amazing job providing footage of the car as well as interviews with the drivers about how the cars have changed throughout the years and interviews with the team leaders about development of the cars as well as Audi’s Le Mans program.