This 1975 Porsche 911S Coupe is the subject of a multi-year custom restoration project which was carried out by the seller upon their acquisition in 2017. The bodywork was modified with a backdated long-hood nose section along with wide 911 Turbo steel fenders and a custom Kingston Grey finish. Inside, the cabin features Mandarin Italian leather with woven inserts and painted fiberglass bucket seats. The car derives power from a Porsche 964 flat-six engine which has been upgraded to a 3.8-liter displacement and features Mahle Motorsports RSR pistons and cylinders, Rasant individual throttle bodies, a cerakoted GT3 intake plenum, B&B headers, a GT3-style muffler, and a custom carbon fiber shroud. The rebuilt 915 gearbox is mated to a WaveTrac limited-slip differential and the car rides on 930-style suspension with Bilstein shocks and adjustable RSR sway bars. A no-expense-spared build created with high-end upgrades and painstaking attention to detail, this custom 911 backdate is now being offered for auction by its seller out of California with just over 975 miles driven since completion.
During the restoration, the car’s outer bodywork was chemically stripped to bare metal while sandblasting was used to strip the interior, luggage compartment, undercarriage, and engine bay. The seat pans were replaced and an early long-hood front slam panel was fitted along with a backdated rear license plate panel. Widened steel 911 Turbo fender flares were welded onto the body and a factory steel hood was installed featuring a custom center-mounted fuel filler. The exterior was finished in the custom color of Kingston Grey and fitted with custom fiberglass-reinforced plastic bumpers, lightweight polycarbonate vent windows, custom Singer-style side mirrors, 9Eleven LED projector headlights, chrome rear bumperettes, and blue/orange Porsche logo stripes along both sides. The car rides on 15” Braid RSR-style wheels dressed in Pirelli Cinturato P7 tires. The seller adds that clear paint protection film is applied over the full front end as well as the side stripes, rear quarters, and the underside of the rear bumper. Detailed images are provided in the gallery.
The cabin is lined with Charcoal square weave German wool carpeting and imported Mandarin Italian leather which covers a pair of custom fiberglass bucket seats featuring Kingston Grey painted shells and woven leather inserts. The door panels, rear quarters, and lower parcel shelf are covered with matching woven leather upholstery while the door garnish, quarter window garnish, and rear parcel shelf are clad in black German vinyl. Other details include a custom one-piece dashboard with a billet control panel, chromed heater control arms with billet knobs, a billet headlight switch and key surround, custom Singer-style armrests, a backdated rearview mirror, Rennline floorboards, a JWest Engineering RennShift shifter, and a MOMO Prototipo steering wheel. The gauges have been completely refurbished and modified with backdated needles and silver-capped pivot pins, custom dials, new lenses, chrome rings, and LED perimeter lighting. The seller adds that there is no A/C or heating in the cabin.
Power comes from an air-cooled Porsche M64 flat-six engine sourced from a 964 model. The engine is bored to 3.8 liters and features a boat-tailed and line-bored case as well as Mahle Motorsports RSR coated pistons and cylinders. New RSR rocker shafts have been installed along with Supertec rockers, Webcam RSR camshafts, Aasco titanium valve retainers, Pauter connecting rods with Clevite bearings, a new GT3 oil pump, new timing chains and guides, and B&B 1.75" headers which are cerakoted in white and paired to a Dansk GT3-style sport muffler. The intake features a cerakoted GT3 plenum and black anodized Rasant individual throttle bodies. The twin coil-on-plug ignition system features crank fire and a MoTeC M130 control unit. A center-mounted front oil cooler was added to supplement the right fender-mounted oil cooler and is paired with Elephant Racing oil cooler lines, a new thermostat, and a refurbished oil tank. The engine compartment is finished off with a custom carbon fiber shroud and lower tin.
The rear wheels are driven by way of a 5-speed 915 manual transmission that was sourced from a 1986 Carrera and rebuilt by Bill Rader Motorsports (BRM). The gearbox includes new synchros, dogteeth, sliders, 930 Turbo bearings, a heavy-duty side plate, and WaveTrac limited slip differential mated to upgraded Turbo axles and CV joints. The suspension was sourced from a 1986 Porsche 930 Turbo and includes 19mm front and 26mm rear torsion bars, Bilstein sport shocks in the rear, Bilstein strut inserts up front, and Tarett engineering RSR adjustable sway bars. The brakes were also borrowed from a 930 Turbo and refurbished along with the installation of a power brake booster. The car was corner-balanced and aligned by Black Forest Automotive in October 2022 and an engine-out service was completed in March 2023. The seller adds that the oil filter was later cut-open and examined by a Porsche Classic Center after the engine break-in period and there were no signs of debris. A valve adjustment was also performed at this time.
This sale will include extensive build records and a clean California title.
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