Ride onboard the Audi R10 V12 TDI, an iconic Le Mans racecar powered by a 5.5L twin-turbo diesel V12. The sound is deep and mechanical, captured from within the cockpit. Built for endurance, the R10 ...

The V6-powered A6 and twin-turbocharged S4 offer two flavors of performance sedan. They're affordable on the used market.