You shouldn't open it fully if travelling at speed. The sunroof should open to a "comfort open" position when you first open it. You then usually have to push the button again to bring it to the fully open position. If you leave it at the comfort open position, I have no problems with it what so ever. I've had three bmw's now, a 320Ci, 135i and X1, all with sunroofs and not noticed the x1 to be any worse at speed than the other two.
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Proud new owner of a X1 23d in Jet Black
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