Audi's A6 and A7 models are flashing their darker sides.

For those luxury buyers with a darker side, Audi has announced special Black Editions of its A6 Sedan, A6 Avant and A7 Sportback models. The special edition cars will be available for order this year, but sales will be limited to the UK market.

In order to give a more sinister look, all three Black Edition models ride on unique rotor-design alloy wheels with a dark titanium finish. The A6 Sedan and Avant get 20-icnhers while the A7 is fitted with a 21-inch version of the design.

All three cars sit lower than their standard counterparts, thanks to suspension systems borrowed from Audi's S line models.

Other exterior design cues include a black finish for the grille, license plate surrounds and the window frame strips. The A6 Avant also receives black roof rails. All models come with tinted glass from the B-pillars back.

Inside that dark theme continues, with the cars sporting black Valcona leather seats, a black headliner and Piano Black inlays.

As far as equipment is concerned, Black Edition models come pretty much loaded to the gills, with standard equipment including a Bose audio system, satellite navigation, Xenon headlights, automatic lights and windshield wipers and the Audi parking system. A7 models gain a bit of extra kit, including a power tailgate, electrically adjustable front seats and a powered retractable rear spoiler.

The Black Edition package can be added to just about any version of the A6 and A7, save for the S6, S7 and the front-wheel drive version of the A7 equipped with Audi's 3.0L TDI engine. Audi suggests the best pairing for the Black Edition models might be the company's 308-horsepower, 479 lb-ft of torque 3.0L turbocharged diesel engine.

Prices for the Black Edition models range from £35,010 to £56,785. The order books are currently open, but deliveries won't take place until early 2013.