We haven’t heared from AVUS performance in a while, but it looks like they are back, this time with the AVUS 2010 Audi S4 which features a number of sleek exterior elements and a power upgrade as well.
Besides the black 20 inch set of custom rims, the AVUS 2010 Audi S4 comes with black painted gear gaiters, front grille and front blade plus a black rear diffuser while the interior the German tuner has added a number of carbon fiber parts.
Due to revised engine electronics the AVUS 2010 Audi S4 is now able to unleash 430 PS, while the new set of suspension springs enhance the car’s driving dynamics.
The final component in the AVUS 2010 Audi S4 conversion is the new stainless steel exhaust system. 
AVUS press release :
A new project of Avus Performance is the sporty version of the popular mid-range Audi. Meant is the S4. In this case it is about a Suzuka-grey limousine that attracts attention by nature. Nevertheless, the Avus-team is not totally of the same opinion here and puts a very special stamp to the “s”port limo“.
In order to give the driving dynamics even better qualities, a thread spring kit was built in that allows adjusting the depth more individually, however still maintaining adjusting possibilities of the Magnetic Ride chassis. The contact to the road is made by 9×20 inch big, 3-part CC-line rims in connection with Hankook Ventus S1 Evo wheels in 255/30/20. To expedite them accurately, the engine performance was adjusted accordingly. Instead of the standard 33 PS, 430 PS are on now. To make the driving pleasure not only palpable, but audible as well, the original mufflers were changed for optimized stainless steal copies. In this case with the tail pipe variant RS4/RS6-look in matt black. In order to make the outer look perfect, gear gaiters, front grill, front blade and heck diffusor were painted in shiny black. Alternatively, these parts can be ordered in carbon as well, carbon parts are also possible in the interior. Among them are interior lasts and center consoles, but also steering wheels with carbon and different types of leather. 

Source: AVUS Performance