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Take a look at this recent installation of 3M Crystalline Automotive Window Film on this 911. This film not only looks cool, but it keeps you cool by blocking out the sun's heat and glare. This particular installation was performed by a 3M certified dealer in the Philadelphia area, Sun & Shade. 3M's has a nationwide network of certified dealers that can install Crystalline on your Porsche. Learn more at https://www.epdwindowfilm.com/automotive/. I'm happy to answer any questions you have.
I've always used 3M film on my vehicles and am quite happy with the performance and lack of problems; however, I have never used the Crystalline but may when my Targa GTS arrives.