When the Audi R8 was first introduced in 2007, many observers argued a more powerful motor might be needed to unlock the true potential of the car. Fast-forward a few years, and a considerably more powerful R8 is a reality.

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Powered by a Lamborghini-sourced V10, the latest R8 sends 525 horsepower to all four wheels thanks to a sophisticated quattro all-wheel-drive system. The car was introduced to the public at the 2009 North American International Auto Show in Detroit.

Though sporting two more cylinders and a little more grunt mid-ship, V10-powered R8 doesn't feature too many visual differences from its V8 sibling.

More air is fed to the ten-cylinder through larger side scoops, which jut out sharply from the body-side, adding a more aggressive stance to go with its increased power. The lower side sill also get an extra flare which runs along the wheelbase, adding further visual cues that this is the true uber-Audi. The changes are subtle enough to be obvious only to those in-the-know, thus keeping the R8's clean lines as uncluttered as possible.

However, some subtle changes from the standard R8 will include dual oval exhaust outlets, bigger side air intakes, a revised front and rear fascias and larger brakes. The V10 version also sports unique LED headlights and a rear diffuser.

Prior to the car's launch, rumors were swirling that Audi would name the V10-powered R8 the R10 or RS8, but the more technical "5.2 FSI" designation was used.

The V10 is the same 5.2L FSI powerplant found in the new Lamorghini LP560-4, albeit detuned to 525 horsepower and 390 pound-feet or torque to keep the R8 out of the Gallardo's territory. But despite being down a bit on grunt, the R8 V10 can still rocket from zero to 62 mph in 3.9 seconds, on its way to a top speed of 196 mph.