Another power upgrade for the already sporty Mercedes C63 AMG from Wimmer, who this time are offering a Level 3 performance kit for the German saloon. 
Apart from black, double spoke design alloys wrapped in Dunlop Sport Maxx GT tires and the RS Sport exhaust system, he Wimmer Mercedes C63 AMG Performance looks like the stock version. However, at a closer look under the bonnet, a series of upgrade that will enable the Wimmer Mercedes C63 AMG Performance to develop 580 Hp and 690 Nm of torque will be noticed.
These upgrades include changes to the air flow through the K&N air filter, the engine electronics have also been optimized, plus the new exhaust features a manifold with a down pipe and a sports catalysts.
The Wimmer Mercedes C63 AMG Performance also features a KW-Club Sport Suspension and pricing for this level 3 upgrade with installation included is 9,990 Euro. 
Wimmer press release :
Wimmer Power Boost for the C-Class C63 AMG Performance – Level 3
Wimmer RST and extreme performance improvements are inseparable. The C-Class C63 AMG Performance itself is already a specific car. Perhaps, this luxury saloon has not been changed so much, but a portion of additional power is obligatory for the Wimmer RST tuner from Solingen.
The Level 3 performance kit for the C63 AMG is available now. It increases the engine output to as much as 580 hp and 690 Nm. Small changes of an air flow through the air filter from K & N, air induction optimization and engine software are also included. A powerful V8 sound is the strength of the Wimmer RS-Sport exhaust system. The vehicle has an exhaust manifold with down pipe, a sports catalyst and optimized cat-back all-stainless steel exhaust system.
The V-Max with the Wimmer power boost brings the power up to about 305 km / h (electronic limitation).
The demonstration vehicle is also equipped with Dunlop Sport Maxx GT tires and the KW-Club Sport Suspension.
The vehicle with the relatively insignificant overtaking prestige will certainly overwhelm various sports car owners!
The cost of the full performance level 3 is 9900 Euro including installation.

Source: Wimmer RS