Audi R8 V12 TDI LeMans

Diesel engines may be more efficient than the gasoline-powered competition, but good old fashioned petrol power has always held a huge advantage when it comes to aural bliss. The engine audio emanating from the Audi R8 V12 TDI LeMans still struggles in comparison to the best gasoline offerings out there, but man does it sound cool. At idle the R8's oil burning, twin-turbo V12 sounds like a Super Duty on speed, but on acceleration the 500-hp powerplant comes alive.

When the TDI R8 is cruising at high speeds, its recorded sound is a lot like a speeding jet.