Quote:
Originally Posted by Poppin Fresh
The open top of the convertible defeats the purpose of having a spoiler to give downforce. It would not be able to compensate for the turbulence caused after the wind goes past the windshield. Unless the top was up all the time. I'm thinking if other cars / car companies did have a spoiler, they would only serve for a cosmetic purpose as well.
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Correct however they are still effective with the top up, especially so with the M3's hard top. Given you'd need to be at a pretty good clip of speed for it to even become effective, I wouldn't think you'd have the top down at those speeds.