Can a supercar have a 5,000-rpm redline?

If you're Audi, the answer apparently is yes. While it's officially a concept car, the R8 V12 TDI looks almost production-ready. It's a bit more aggressive than the standard car, with a low, low carbon-fibre splitter, high-mounted central air intake and big wing. But the drivetrain is the real centrepiece - a twin-turbo diesel V12 that produces 500 hp and 737 lb-ft of torque.
Diesel performance is, of course, not new to Audi. Its Le Mans racers have deployed the high-torque, fuel-saving engines for years with impressive race results.