This 1976 Porsche Kremer 935 has raced at the Nürburgring many times throughout its life--having been driven by well-known German racer Jürgen Oppermann--and is ready to head back after thorough mechanical preparation. Sporting its later Vaillant Air Conditioning Co. green and multi-colored-stripe livery, the 935 comes with an 806-horsepower, 3.0-liter flat-six with twin turbochargers. Find it for sale on eBay Motors for $399,000, or you can make them …