MOST FUN
AUDI R8 TDI CONCEPT

Audi had guitar-wielding rock Bryan Adams on hand to help unveil its spectacular new R8 V12 TDI concept. The gravelly-voiced Canadian musician was an appropriate choice of sidekick, because this Audi rocks.

As if the standard R8's 420-hp, 4.2-liter V8 gasoline engine isn't enough, Audi has shoehorned its upcoming 500-hp, 6.0-liter V12 common-rail diesel powerplant into the back of its low-slung two-seater, creating the world's first diesel-powered supercar in the process. It's the diesel's whopping 738 lb-ft of torque that really steals the show--more than double that offered by the standard R8--and all of it is maintained between 1750 and 3000 rpm. The figures speak for themselves: 0 to 62 mph in 4.2 seconds and a top speed in excess of 186 mph. Add a more muscular body and gee-whiz instruments, and you've got a surefire recipe for fun.