Congrats on getting the DTM kit, it is the best looking kit on the market, in my opinion. You will really notice a difference- also might want to think about getting it lowered if you haven't already.
Wish I could suggest someone to help install it, but just look up custom auto shops and find out if they work on European cars. You might even want to call a local mercedes dealer and see if they do it or can recommend another shop.
Be sure to send some pics when its all installed. Good luck...
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