The Sonderwunsch Speedster was specified in the same shade of Slate Gray as the 1970 911 S used by Steve McQueen in the opening scene of Le Mans; it is the only Speedster painted this color. Its seam-welded chassis was fitted with a suspension similar to that of the 964 RS, albeit with some minor differences. The springs were slightly softer and the car sat 10mm higher than an RS, but 30mm lower than a standard C2 Cabriolet. It received the hydraulic brake boost system from the RS and Turbo 3.6 (normal Speedsters used the vacuum boost system from the C2) along with the same brakes as the Turbo 3.6, black four-pot Brembo calipers and cross-drilled, ventilated rotors. It sat on 17-inch aluminum Cup wheels.
As it was an open-top sports car destined for life in the city, Sprenger focused more on providing strong acceleration and less on top speed. As a result, the G50/10 gearbox was altered with longer ratios on the first three gears. The gear synchronizers were made of steel and further modified for quicker shifting, and the transmission mount itself used firmer rubber. Where a standard Speedster made do with the stock 247-hp 964 engine, the Sonderwunsch Speedster boasts 260 hp from a blueprinted engine with remapped ignition and DME chip set with aggressive timing advance. Like the 964 RS engine, it needed to run on 98 RON petrol (98 percent octane, 2 percent pentane) while standard 964 engines are set up to run on 95 RON petrol.
Tipping the scales at 2,888 pounds with a full tank, it weighs a good 220 pounds less than a standard 964 Speedster. The weight savings are attributed to alloy doors and bonnet from the 964 RS and replacing the standard fenders with hand-fabricated panels made from super-strong, thin-gauge steel. And since it was intended for spirited driving and not track use, standard sport seats were specified and upholstered in black leather. All told, the Speedster took Sprenger's team almost nine months to complete and it was finally delivered in September 1994. In 2010, Yeung presented Sprenger with a scale model of the very car he had created.
It turns out that Mr. Yeung is not just a client but also a friend of the folks at Porsche. He also serves The United Nations Children's Fund (UNICEF) as Chairman of Fund Raising and Special Projects. Following the devastation of the Wenchuan earthquake in 2008, Porsche came to help in Sonderwunsch style. Helmut Broeker, Porsche's CEO for China, provided four bespoke Porsche Cayennes to UNICEF to serve as mobile educational, training, and resource units. These special Cayennes have been on active duty since December 2009 and have provided support to some 500 schools in the most remote mountainous areas affected by the earthquake. Porsche AG has also committed 10.2 million RMB ($1.5 million) over three years to support the new Empowering the Future Children's educational program with UNICEF. And each year, runners from Porsche Hong Kong participate on UNICEF's annual charity run held in November at Hong Kong's Disneyland. Who says the good guys can't win?
It's been 16 years since the Speedster left the red brick building at Werk 1, and now it's my turn to drive it. I grab the Porsche Momo sport steering wheel-perfect for fast driving. I turn the key and the engine comes to life. The accelerator is well weighted and the engine has a lovely rounded wokka-wokka-wokka tone at idle. Even below 1000 rpm there's plenty of thrust from 240 lb-ft of torque. But only as the tach swings for the redline does the 3.6 come alive, filling the open-air cabin with a deliciously addictive, hollow, vintage racer-like bark. Addictive indeed.