Leather upholstery is standard in the 2007 Porsche 911 Turbo, decorating the more attractive and comfortable interior that debuted on the current generation 911 Carrera two years ago. To separate the 911 Turbo from its plebian brethren, it also includes a unique gear shift and “Turbo” logos on the door sills. Porsche also replaced the old audio system with a 13-speaker Bose surround sound system and added a navigation system, too. Of course, Porsche would be remiss if it didn’t imbue its super machine with a generous array of safety features, including the Porsche Carrera GT supercar’s braking system.