Just did the Huper Optik Drei (metalic) on the X5 and it's been 100% trouble free.. the temp reduction (living here in Phoenix, Az) has been nothing less than spectacular!

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BMW - X5 4.8i w/all US options packages, 19" Y wheels, White/Tobacco, Huper Optik 50% tint
Mercedes Benz - E320 CDI Park Assist, NAV, Folding Mirrors, Premium Sound, Voice Command, Sunroof, Auto Rear Shade, Bi-Xenon