Engineers at Wheelsandmore are presenting their power upgrade packages for the Mercedes C63 AMG and SL63 AMG models, which took 2 years to complete.
The 6.3-litre engines powering the Wheelsandmore Mercedes C63 AMG and SL63 AMG received a remapped ECU, while other modifications that help raise total output include a new stainless steel exhaust, 4in1 manifolds, catalytic replacements tubes and remote controlled sports mufflers. 
The Wheelsandmore Mercedes C63 AMG is now capable of producing 570 HP (419 kW) and 690 lb-ft instead of 457 HP (336 kW) and 600 lb-ft while the Wheelsandmore Mercedes SL63 AMG spits out 600 HP (441 kW) and 710 Nm instead of 525 HP (386 kW) and 630 lb-ft.
Both Wheelsandmore Mercedes C63 AMG and SL63 AMG models can reach top seeds of beyond 185 mph and elements that complete the conversion include custom 20 inch rims wrapped in Dunlop Sport Maxx GT tyres and adjustable coilover lowering modules. 
Wheelsandmore press release :
After 2 years of intensive development the Wheelsandmore engineers finally presented their power packages for the AMG 63 models.
At this extraordinary meeting in the middle of german spring time 4 modified AMG models got together with a total power of 2340 hp.
All the 6,3l engines got a software update and a complete stainless steel exhaust system, contending 4in1 manifolds, catalytic replacement tubes and rear sport mufflers with valve flaps, which are able to be controlled with a remote control.
The c-class engine is upgraded from serial (336kw) 457hp / 600 lb-ft up to (419kw) 570hp and 690 lb-ft, the SL 63 AMG engine is growing from (386kw) 525 hp / 630 lb-ft to totally (441kw) 600hp with 710nm of torque. Within this modifications all those AMG models easily going beyond 185 mph.
Perfect handling, a much sportier look and an extra performance upgrade is delivered with the mounted wheel models. The C-Class models are wearing the Wheelsandmore ultralight forged wheel models “6Sporz” and “TS-1”, sizing 9,0×20 inch in the front with 235/30/20 Dunlop Sport Maxx GT tyres and 10,5×20 inch with 275/25/20 rubbers on the rear.
On the SL63 models the german individual tuner took the same 3-piece forged models with maximum sizes. The front axles are equipped with 255/30/20 tyres on 10 inch, the rears are coming with enormous 305/25/20 rubbers on 12 inch rims.
The perfect roadability delivers a stainless steel full race coilover with adjustable compression and rebound at the C-Classes and at the roadsters the wheelsandmore electronic lowering module “LowMaXX” were installed.

Source: Wheelsandmore