Back in the day 928 S4 had an adjustable wing for like a year until the research said only like 1% of owners adjusted it. Thereafter, they fixed it at the factory. I detest the wings that have no aero effect or even worse no aero testing at all (admittedly, now a days, that's not even possible because of MPG focus, but way back, it was just ridiculous, and of course, after market can be anything)