Audi TT RS roadster to roar into Geneva motor show

Under the hood of the Audi TT RS is a 2.5-liter inline five-cylinder engine with direct injection and a turbocharger. That's right--Audi is dipping into its heritage with a new five-cylinder engine.

All that powertrain hardware is good for plenty more than 300 hp, Audi says. Top speed is limited to 155 mph--but it would go faster if the electronic leash was removed. The quattro all-wheel-drive system is standard.

Oh, and it sounds mighty fast. How do we know? Because Audi has put out a digital recording of the car. Give a listen.

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