Quote:
Originally Posted by monsta
aren't the opening there b/c of aerodynamics, it helps with the downforce as air flows through the bottom then out the back flowing through the opening and not creating lift...
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That's the theory. No data from BMW on how much it actually does. In race cars the whole bottom of the car is optomized for effectiveness, but it's a bit more difficult to do in production cars. The M3 has a comendably smooth underside, though.