The Germans from Wheelsandmore have made the fastest production model from Audi, the R8 GT, even faster.
As you probably know the standard version which has been limited to 333 exemplars, benefits from a more powerful V10 engine producing 560 HP and a weight saving program that makes the car around 100 Kg lighter than a regular R8 V10.
The tuners from Wheelsandmore have applied the same principles one more time and enabled the the Audi R8 GT to deliver 611 HP and 585 Nm of torque via improved electronics, while the standard exhaust system has been replaces with a new, handcraft, stainless steel system which features remote controlled valve flaps and is around 40 percent lighter.
This enhancements enable the Wheelsandmore Audi R8 GT to sprint from 0 to 100 Km/h in 3.3 seconds and reach a maximum speed of 335 Km/h.  
Wheelsandmore calls their creation the Supersport Edition, and in terms of visual details the car received a set of 20 inch, matte black coated lightweight wheels wrapped in Continental Sport Contact 5P tires. The R8 GT Supersport Edition has also been fitted with a remote controlled hydraulic lift up system which can provide an additional 40 mm of road clearance. 

Source: Wheelsandmore