German tuner Inden Design has prepared a tuning program for the W221 series Mercedes S500, which brings the luxury saloon closer to the S65 AMG in terms of both appearance and performance.
At the exterior the Inden Design Mercedes S500 received a modified front bumper, new side sills and a rear diffuser together with daytime running lights, retouched taillights and a set of 20 inch multispoke design alloys wrapped in tires size 265/30-20 front and 275/30-20 rear.
The Inden Design Mercedes S500 also comes with a series of chrome parts coated in matte charcoal gray in order to match the matte gray body finish, plus a 50 mm lowered suspension.
The interior has also received a new level of exclusivity due to a combination of two-colour leather and black Alcantara, and black carbon elements that replace the former wood pieces.
In the performance department the Inden Design Mercedes S500 has been dialed at 420 HP thanks to a stainless steel exhaust system with AMG tailpipes, plus the car now comes with an upgraded braking system (6-piston calipers at the front and 4-piston calipers at the rear) borrowed from the S600 V12 BiTurbo. 
Inden Design press release :
FLY EXPRESS – unequal rival by INDEN Design
An icon of good style in the luxury class is the Mercedes-Benz S-Class without any doubts. Unending comfort, last future-oriented technologies, as well as all conceivable safety precautions are inevitable in the car of this category.
The widely known beyond the borders of the Hessian Haiger-Flammersbach noble tuner INDEN Design specializes in the just discussed vehicles, located very near the top category. In this case, Joachim Inden, which is known for so many masterpieces, has undertaken to rebuild the S500 of W221 series from Stuttgart to the facelift version of the S65 AMG. The modifications at the front, the side sills and rear diffuser are associated with the highly visible and distinctive quality of INDEN-Design. Of course, daytime running lights were also installed, and tail lights and mirrors were retouched. The vehicle is completed with the chrome parts, coated with charcoal-gray matte film.
The performance increase up to 420 hp, in particular thanks to a stainless steel exhaust system with two AMG tailpipes left and right, almost inevitably involves lifting of the Vmax limiter. Due to the increased power, the braking system was “converted” to the S600 V12 BiTurbo model with 6-piston front calipers and 4-piston brake calipers. The right set of rims for the perfect vehicle in dimension of 10.5 x 20" with tires in 265/30-20 at the front and 275/30-20 – at the rear axle was fully installed. The standards of agility are set by lowering by 50 millimeters.
As might be expected, the interior was also not spared. The A, B and C pillars, the headliner at the dashboard and door panel are trimmed with two-color leather in combination with black Alcantara. In addition, all former wood pieces were replaced with black carbon parts. The speedometer change to a 360 km/h-scale closes the series of changes inside the vehicle.
As seen in the photos, thanks to INDEN-Design, the Mercedes stomp their hooves impatiently in anticipation of a power struggle with the unequal rival…

Source: Inden Design