Porsche’s GT3 RS 4.0 was the last 911 based on the original 996/997 platform and is the most powerful normally aspirated flat-six ever offered by the German automaker. The four-liter, four-cam engine produces 500 bhp at 8,250 rpm and tremendous torque, a whopping 339 foot-pounds. A new intake manifold, new higher-flow air filters within carbon-fiber housings, less-restrictive catalytic converters to reduce exhaust back pressure, Variocam-Plus variable valve timing, and a two-stage variable induction system all help produce a stunning 125 hp per liter.

Porsche put the existing GT3 on a diet, trimming an additional 22 lbs. through the use of carbon-fiber front fenders and trunk lid, titanium connecting rods, and lighter interior trim. There are a multitude of sophisticated electromechanical systems aboard that can control traction and adjust suspension settings almost instantaneously.

This beautiful example is finished in Carrara White with a black and red leather interior, accentuated by numerous additional carbon-fiber interior trim pieces and distinctive 4.0 trim. It is fitted with six airbags, automatic climate control, a security system, and a high-end entertainment system. Exclusive options include sun visors trimmed in Alcantara, carbon rear center console, and an aluminum driver’s footrest. The car was also optioned with the Front Axle Lifting System to help prevent scraping the front spoiler on steep driveways.

Capable of astounding over-the-road performance, this GT3 RS 4.0 also features Porsche’s optional track-proven PCCB carbon-ceramic brakes with power assist, applied through six-piston alloy calipers in front and four-piston calipers in the rear. The 19-inch-diameter multi-spoked light-alloy wheels are 9 inches wide up front, and a full foot wide in back. They have been powder-coated white to match the body; this is the only cosmetic change from new.

The Porsche was originally delivered to McKenna Porsche in Norwalk, California, in December 2011. The current, and first private owner acquired the car in 2013 with only 116 miles and had the RS 4.0 titled in New York in October of that year. Today, the odometer shows just 4,543 miles. Although this car was originally built without Porsche’s comprehensive navigation system, an OEM unit was installed by Manhattan Motorcars in New York City, which also recently performed a four-year service that included all filters, fluids, and spark plugs at a cost of $4,400. Properly maintained and garaged since new, the Porsche has never been tracked or abused. It is supplied with a its original radio, car cover, trickle charger, additional rubber floor mats, as well as a Certificate of Authenticity, original factory documentation (including its original window sticker), and service records from Manhattan Motorcars.

Only 600 examples of the GT3 RS 4.0 were built, and many were quickly acquired by private collections. Here is a rare opportunity to acquire a very desirable high-performance Porsche, the last of the free-breathing 911s.