WE don't get to drive autobahn speeds here in the state's, and the wing project that i have plans with is wider in width by 15 inches on either side of our stock spoiler, and 8 more inches in depth frt to back, so their is no down force issue's. But man does it add character to this car. I can't drive anywhere without people asking 1000 questions. Thanx for your input, it,s nice to know people still have back.