Factory tinted windows do not provide the same benefits as tinted window film. Factory tinted windows do not block UV rays, glare or reduce heat inside your vehicle. Aftermarket window tint on other hand can do all of that. Call Bluemax Window Tinting 925.339.1049 #Porsche Cayenne tinted windows with 3M Ceramic IR to the front windshield 70%, 50% 2 front side windows and 25% over the rear factory tinted windows.