While some may argue that the Audi S8 is maybe too formal by design, no one can deny its status as a luxurious->ke505 and powerful sedan. And although it is fighting a tough market, the 520 horsepower and 481 pound-feet of torque that lie under the hood make a very compelling case.

To some more demanding owners and potential customers that's not enough power. But with no versions above the S8, they either have to choose a different body and go with the RS7 -- rated at 560 horsepower -- or take it to ABT Sportsline->ke1753, the No. 1 specialist when it comes to Audi->ke14-badged vehicles, for a little extra something.

Based on the facelifted S8, the company's latest product comes to fill the gap with a sedan->ke142 that has all the luxurious standard features fitted from the factory and a hefty power increase on top. With more than 600 horsepower and tap, the S8 by ABT Sportsline has its very own combination of exterior paint and wheels, but, as with most of the tuner's products, customers are allowed to add numerous extras before taking delivery.

Click past the jump to read more about the 2014 Audi S8 by ABT Sportsline.

Audi S8 by ABT Sportsline in detail

Using its new power management system, ABT Sportsline managed to increase the output of the 4.0-liter, V-8 engine by no less than 120 horsepower and 96 pound-feet of torque. That means the sedan now benefits from a whooping 640 horsepower and 575 pound-feet, more than the R8 LMX, the most powerful Audi-badged sports car you can buy nowadays. To round things off, ABT also added a new muffler system made of stainless steel.

Dressed in a graceful shade of black, the S8 received the company's 21-inch DR alloy wheels finished in Mystic Black for an overall darkened effect. However, the vehicle can also be fitted with the smaller, 20-inch ER-C wheels in either Silver Bullet or Gun Metal colors. Additionally, ABT can throw in the Level Control option that lowers the car by 25 mm (1 inch) at each axle.