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who said it won't reach top speed with it on, it does destabilize because of it's flexibility, but the car has no problem reaching 162 stock with it mounted. And I believe it works like diverters found on SUVs it's designed more to direct flow in a uniform direction, the way the cobalt is designed, I believe without the wing it produces a dirty air current when air mergers between the roofline and the door. Kinda obvious the way the antenna vibrates in the vortex , probably even worse without the wing, though I wasn't paying close attention to that particular detail. GM had no problem with a recorded top speed on the 'ring at 163MPH during the test lapping. The wing isn't the issue I think it has alot to do with conditions whether or not the car will behave, it is extremely susceptible to cross winds, reduces my mileage, even when I slow down to compensate, more than it should IMHO, that's the only downfall of the car, if that engine was in a honda, I'd bet on 40mpg for sure by now. Cobalt didn't really have aerodynamics in mind, oh well though.
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