Your enthusiasm is admirable, but I mean... it's a BMW wagon. It's never going to be a Lotus on the track. I really doubt you'd be able to discern a noticeable performance increase by deleting the sun roof. I say just enjoy a nice feature of the car. When I had my Audi Q5 and then SQ5, the panoramic roof was one of my favorite features.... and that was in Connecticut! Now that I'm back in San Diego you can bet I enjoy popping the top on my E90 whenever possible.
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