The One-Off 1987 Porsche 959 "Speedster" in PhotosThe unique build is the handiwork of Karl-Heinz Feustel.The one-off 1987Porsche 959 ‘Speedster’The custom build features a unique windscreenThe 959 “Speedster” in profileThe interior of the convertible is blueInside the custom buildthe vehicle features a blue soft top and matching tonneau coverThe car also comes with a removeable white hard topThe one-off 959 Speedster could sell for up to $1.7 million at auction