UltArc - The hidden things I want to try revolve around the wheel arches (no pun intended). Since I am a spirited driver at times, I want to keep brake cooling still optimal while at the same time reducing drag and lift in the arches. I am thinking to try an arch within an arch as in one attached to the suspension and just about a 1/4" around the tire. If I can then "isolate" the upper part of the arch, this will reduce turbulant air in it. I know how I have it in my mind but hard to fully explain. If it works, then it will be hidden unless you remove the wheel.
Andrzejm - Indeed another BMW driver although I will not be going as far on external bodywork as you have. Actually from your small avatar picture, I wouldn't even have guessed the right vehicle! Nice color matching for stealthness of the modifications.
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