30% is plenty and you can put clear on the windshield to block the heat. I also tinted my moonroof but this area is hot, if you haven't spent a few summers here you don't understand.
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2012 535i M-sport: Alpine White/AnthraciteTrim, Black Nappa Leather, Cold Weather, Luxury Seat, Premium Pkg, Premium Sound, Technology Pkg, ARS, 6 MT, HUD, Active Steering, 270 Cameras. 75% Llumar outside-100% Llumar inside.
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