CLP Automotive, a German company specialized in the development of body kits has created a series of upgrades for the fourth generation BMW M3 that will turn the Bavarian coupe into GT racer.
For 8,880 Euro they will add a a pair of redesigned spoilers, a new front wing, engine bonnet, side channel bar and sidewall jet, plus a new rear apron. 
The more expensive part is the the addition of a series of motorsports derived mechanical upgrades. These cost 69,000 Euro and include a power optimisation program which will enable the CLP BMW M3 GT to develop 600 HP, an optimized Bilstein-thread, an Akrapovic titanium exhaust system and white 19 inch sports wheels.
At the interior the CLP BMW M3 GT features Recaro bucket seats, plus the tuner says they have also applied a series of weight saving measures to the car.

Source: CLP Tuning