Quote:
Originally Posted by alohaspirit
It does reduce your CdA (back to stock numbers)
But it wont cause flow separation unless you open your sunroof.
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Quote:
Originally Posted by ChazInMT
I think you're better off not having the deflector, and your "non-smooth surface" concerns are unwarranted. Significant flow separation requires more drastic obstacles than what the little bumps on your sunroof present....don't worry about it.
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Okay, thanks guys. I'll won't loose any sleep over it! The sunroof stays closed most of the time anyways.
I think that any FE increase would be very small, but 'it's the many little changes which make the difference'.