The Audi S5 Sportback is inching closer to production as the high-performance model has been spied undergoing testing in Germany.

Looking sportier than its predecessor, the redesigned model has an evolutionary design which adopts a number of styling cues from the new A4.  The swirly camouflage hides some of the details but the car has been equipped with a new front fascia that features a wider grille and angular headlights.  Moving further back, there's a rakish windscreen and a gently sloping roof which tapers down to a hatchback with an integrated spoiler.  Other notable highlights include lightweight alloy wheels, a four-tailpipe sports exhaust system, and a sport-tuned suspension which reduces the model's ride height.

The interior will largely carryover from the standard model but drivers can expect to find Nappa leather / Alcantara sport seats, illuminated door plates, and brushed aluminum trim with matte finish.

Like the S4 and S4 Avant, the S5 Sportback will be powered by a 3.0-liter V6 TFSI engine that produces 354 horsepower and 369 pound-feet of torque.  The engine will be connected to an eight-speed tiptronic transmission and a rear-biased qauttro all-wheel-drive system.  This should enable the hatchback to accelerate from 0-62 miles per hour in approximately 4.8 seconds before hitting a limited top speed of 155 mph.

Gallery: Audi S5 Sportback spy photos

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