There is a good shop in neuendettelsau. They are 3 brothers that work on all kinds of cars but I think they prefer BMWs. One drives an M3 and the older drives an M5. They mentioned that they perform tunes as well. That's where I got my springs installed. Pretty good prices too. I can get the shop name if you are interested.
Eibach Pro-Kit springs, 19 inch Volk Progressive ME
Great product for energy, focus, and weight management.