2007 Porsche 911 GT3

One could argue that the bodywork is more fitting for a race machine, that the wings and slots clutter the 911's timeless lines. The academic in you, however, will appreciate that the various surfaces produce aero-dynamic downforce front and rear (even at low speeds) yet the overall drag coefficient is just 0.29. Besides, after four decades that iconic Porsche profile is getting awfully familiar. The GT3's dress-up adds some welcome spice. You should see one of these things in Speed Yellow.