Audi TT RS could have I5 or V6 power

Since its introduction in 1999, the Audi TT has been known for its unique look — and its lackluster performance. The TT hasn't exactly been slow, but its lack of serious horsepower made it more of an image car than a true driver's coupe. This might change with the introduction of the 2009 Audi TT-RS, an all-out performance version of the stylish TT.

Caught testing on the Nürburgring test track, the top-of-the-line TT wears several telltale design elements that identify it as a high-performance RS model. Up front, the TT-RS has the same metallic trim across the grille as the TTS, but closer inspection reveals large air intakes at each corner in place of foglights. Other styling differences include seven-spoke wheels and a pair of oval tailpipes, a signature RS design cue.

It's hard to peg which engine will provide the power for the TT-RS at this point. Early rumors suggested a turbocharged five-cylinder, but the recent introduction of Audi's new 3.0-liter TFSI V6 suggests otherwise. The new supercharged motor is expected to develop roughly 300 horsepower in U.S. trim, a number that would put the TT-RS a solid notch above the TTS with its turbocharged 265-hp inline-4. Expect one of Audi's S tronic dual-clutch gearboxes with either six gears or possibly even seven.

Like all RS models, the TT version will also get a retuned suspension, larger wheels and tires and upgraded brakes. Minor interior upgrades will be part of the package as well. Given the lack of camouflage on this test mule, expect a public introduction in the next few months, with U.S sales starting by early next year.