This 1974 Porsche 911 (chassis 9114102980) has been transformed into a radical street/track machine running a full cage, built suspension, and custom 3.5L twin-plug motor. Previously featured in Excellence magazine as the subject of a five page story, the car is well known, well developed, and competitive. Comprehensive build details are available on a separate sheet contained within the Flickr gallery below, and the seller describes its development as being a no expense spared process. Sold with both NASA GT2 and NCRC GT1 logbooks, he adds that it outruns 996 GT3s from a standing start with ease. It is now available in San Francisco, California for $55,000.

​The car includes two decklids—a classic ducktail for street use and 993 GT3 elevated wing for track use, the former featuring a cutout for the 996 chassis GT3 intake plenum and air filter. Fiberglass panels include the hood and front and rear IROC style bumpers, while a custom built front splitter sits underneath the nose. The rear window is Lexan and looks cool with hold down straps, and for additional weight savings the rear side items are also made of the same material. Polished, staggered, black center Fuchs work well with the midnight blue main body color, and its track focused stance is both functional and attractive.

​Inside the cabin we find Recaro SPG XL race seats (hard-mounted driver’s, passenger’s on Recaro sliders), deleted rear seats, a Schroth six point harness for the driver, Rennline lower dash delete plate, Appbiz RS style carpets, Rennsport door panels, and a custom 6-point roll cage. A Racepak lap timer/datalogger sits atop the dash, a small diameter suede-wrapped Momo wheel with center marker controls the helm, and a great looking Wevo billet shifter swaps gears. Overall a very function biased environment, but roll down glass side windows help retain just enough civility for occasional street use.

​Built by Rothsport, the bespoke 3.5 was dyno’d at 330 flywheel HP @ 7400 RPM during break-in. Spec details include the following:

3.0 case

3.2 crankshaft

Pauter connecting rods

Mahle 100 mm pistons

GT3 oil pump

twin plug heads fired by a 964 distributor

custom ground billet cams (roughly approximate to GE100 specs)

Rothsport individual throttle bodies using 48 mm butterflys with GT3 intake plenum

Jet-Hot coated 1.75” George’s European Racing headers

10,5:1 compression ratio

DTA S60 standalone ECU

twin front fender mounted Carrera oil coolers

Power is put down through a magnesium case 915 case with stock gears (freshened in 2011 with new synchros and sliders for 2nd, 3rd, and 4th), Wevo clutch kit, and OS Giken clutch type limied slip differential. Other Wevo add-ons include a bearing retainer plate, positive shift joint coupler, and cooling setup with spray rail over gear stack and external pump circulated radiator. The diff housing cover is late SC spec, and G50 input shafts and axles round things off nicely.

Stopping is handled by 930 brakes front and rear, both ends benefiting from Performance Friction pads and new rotors dating from 2012. Tilton provides a dual master cylinder and remote bias adjustment. Wheels are 7” x 16” in front and an inch wider in rear, hollow torsion bars measure 24 mm in front and 33 mm in back. Elephant Racing Von shocks and adjustable Smart Racing sway bars are found on both ends, while adjustable rear spring plates, poly bronze bushings, spherical A-arm bushings, cage welded strut brace and a Wevo front camber plates complete the setup. Empty weight is roughly 2,300 pounds, and further spec details are available in both the aforementioned spec sheet and Excellence article contained in the Flickr gallery linked below. This final embedded image shows the car with its track-biased 993 GT3 wing in place.

Click here to email the seller directly if you are interested.

Check out the additional photos here in the Flickr album and slideshow below.