When Porsche was told that it could no longer bring the Type 930 Turbo into the United States after 1979 because it couldn’t meet tough new emissions regulations, production nearly ceased. After a six-year hiatus and the development of a new electronic engine management system to control exhaust emissions, Porsche brought the 911 Turbo back to the U.S. market.

In that same period, a number of wealthy clients asked the factory to create street-legal versions of the brilliant 935 Group 5 car under its Special Wishes Program (Sonderwunschprogramm). They featured a flat, aerodynamic nose with retractable headlights, widened and louvered front fenders, more muscular rear quarters with air intakes and stylish “strakes,” extended and boxed rocker panels, an additional oil cooler, and a large rear spoiler, which housed an intercooler atop the engine lid. After 930s returned to the U.S. market in 1986, Porsche formalized the design the following year, with option number 505, also known as the 930S, for the U.S. market and option 506 for the Rest of the World, as Porsche called it. This option code could be ordered for an additional $23,244.

This rare factory-built Flachbau 930S Cabriolet was completed on January 28, 1988, and was then shipped to Valley Imports Inc., of Fargo, North Dakota. It was delivered on March 28, 1988, to its first registered owner, Mr. Randy Marten, who has been described as an enthusiastic Porsche collector. This rare car was subsequently sold to another discerning collector in Ohio, where it remained until recently. It still wears its original and near-perfect Guards Red paint, with a black canvas folding power top and boot, and it is trimmed in special supple Champagne leather with a leatherette beltline and black carpeting.

According to its factory-issued Certificate of Authenticity, this Turbo was delivered with a 40-percent limited slip differential to help get its 282 horses to the pavement. Among the many factory options included on the car are heated driver and passenger seats, which also have 12-way adjustment to provide the driver with a perfect position. In addition, both seats have adjustable lumbar support. The Sport steering wheel with an interior-matching leather rim has a raised hub and a painted crest. Both outside mirrors are heated and electrically adjustable. To help keep the occupants comfortable, the side windows are power-operated and there is an air-conditioning system. The buyer specified a Blaupunkt Reno SQR stereo cassette player and multiple speaker package, as well as an alarm system. The front trunk contains the car’s original collapsible spare wheel and tire, a tool kit, an air compressor, and a jack. The compartment is trimmed in Black Velour, and the car has a set of color-coordinated accessory floor mats. The car’s original Goodyear Eagle tires are mounted on Fuchs forged alloy wheels, with the center spokes painted to match the body, and they are highlighted by hand-painted center cap crests.

This wonderful Slant Nose Cabriolet is a true time capsule, as it appears so fresh and new that it might have rolled out of Porsche’s factory yesterday. It has been driven only 2,401 miles at the time of cataloguing, and it is supplied with all of its original documentation, owner’s manuals, a warranty book, a pristine tool kit and jack, and an electric air compressor for the collapsible spare tire.