When Audi launched the third-generation TT earlier this year, observers noted that its shape remained similar to the first- and second-generation models. Word was that Audi designers intended a more futuristic rear end, but Volkswagen Group chairman Ferdinand Piëch himself insisted that the new model shouldn't deviate too far from the iconic styling language of its predecessors.

With the TT Sportback concept for the Paris motor show, Audi's styling department has taken more liberties. This is the third concept based on the third-gen TT. First, we saw the Allroad Shooting Brake concept at the Detroit show in January, followed by the four-door TT Offroad concept at Beijing in April. Like the TT Offroad property, the new TT Sportback is a four-door, but it features a far sportier roofline and a more angular, futuristic rear end.

At 176.0 inches, the TT Sportback is 11.4 inches longer than the production TT. It has a 4.9-inch-longer wheelbase and is 1.1 inches lower. It’s also 2.3 inches wider, thanks to protruding wheel arches, which house 255/30 Dunlop rubber on ten-spoke, 21-inch wheels. The lengthened body and wheelbase make room for two relatively spacious rear seats with plenty of legroom; the Sportback's rear compartment is a far cry from the torture chamber in the TT coupe.

View Photos MARC URBANO, THE MANUFACTURER

We like the subtle enhancements to the TT's styling, which would look good on the regular TT. These include a wider grille and reshaped headlights, now featuring laser high beams like those found on the R8 LMX. The elegant lower front air intake is reminiscent of the face-lifted A8. Flush door handles, body-colored mirrors, and wide dual-exhaust pipes emphasize elegance over brutalism.

Audi is so proud of the new production TT's revolutionary dashboard that changes for the concept are kept to an absolute minimum: A thin, glossy decorative strip stretches over the entire width of the cockpit. That's it. The leather and faux suede, of course, are bespoke tailoring for this concept car; its beige color underscores the theme of elegance and discreet luxury.

It could almost fool you into thinking that this TT likes to play it nice and soft. But under the hood lurks a real beast. Audi has convinced the single-turbo EA888 2.0-liter TFSI four-cylinder to crank out a full 400 horsepower; it will propel the Sportback concept to 62 mph in just 3.9 seconds.

View Photos MARC URBANO, THE MANUFACTURER

This ultrapowerful EA888 might imply that the next TT RS will be powered by a four-banger, as well. But that’s not the case. The highest-performance version of the TT, expected to launch in 2015, will continue to be powered by a turbocharged straight-five generating something north of 400 horsepower.

The TT Sportback show car could actually become a series production model. Audi R&D chief Ulrich Hackenberg says that, "it is a new member of a possible TT family." He has hinted at further body styles of the TT before, going beyond the current coupe and the upcoming roadster versions.

We like the TT Sportback concept, which is a sporty four-door that, for once, is based on an actual coupe and isn’t just a sedan with a sleeker roofline. Bring it on.

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