What makes the Audi R8's engine unique?

I've heard a lot about Audi R8's engine performance, but what specific features or technology sets it apart from other cars in its class?

The Audi R8's engine is a high-revving 5.2-liter V10 that produces 532 horsepower! It's paired with a seven-speed dual-clutch automatic transmission and Audi's Quattro all-wheel-drive system for incredible power and traction.

One unique feature of the Audi R8's engine is its FSI (Fuel Stratified Injection) technology, which delivers fuel directly into the combustion chamber for more efficient and powerful combustion. This results in better acceleration and improved fuel economy.