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On my car, the shade doesn't have any louvers, mesh, or holes to allow air to pass. It is possible to tilt the roof panel, but the shade can then only be closed about 80%, or approximately 3" from being fully closed. Being somewhat "airtight" in the closed position, driving around at speed with the glass tilted would create a fair amount of vacuum on the shade and perhaps cause damage.
From a "look" standpoint, I enjoy sunroofs in my daily drivers but tilting them tells the rest of the world the I chose to pay more to carry around extra weight, and have it located at the highest possible vertical CG.
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F87 '16 M2 ... Mineral Grey, 6MT, Exec, MPE
Gone: E82 '13 135is 475/586 ... Mineral Grey / Oyster, DCT, Premium, Tech, HK, Michelin PSS, BMW Performance Suspension |