Audi's TT roadster is mighty sporty inside and out. But for some, that's not enough. Those enthusiasts will want the Audi TT RS, which will make its debut at the Geneva motor show. Audi is giving us a peek ahead of the show.

But here's the bad news: This bad-ass TT has not gotten the OK from Audi honchos to be sold in the United States--at least not yet.
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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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