Wandered to DTM's Facebook, this is the 'teaser' you speak of? Concept? Or is this the production piece?
And while I appreciate you could care less about your car's mileage, given your performance goals, I was simply speaking from an engineering / physics standpoint. I am not insinuating you instantaneously turn into a Hummer for MPG. I may be wrong as I am a bit rusty on my aerodynamics, but it just seems to me that for typical use AND IN THE LONG RUN, the increased drag coefficient doesn't help the typical driver who may look at this as a 'performance part'. It's track oriented, or done just for looks.
But whatever, if you'd like to laugh at my questioning, then I'm not going to bother.