The Porsche 996 Turbo debuted at the Frankfurt Auto Show in September 1999. The Porsche 996 Turbo is powered by a water-cooled twin-turbocharged and intercooled 3.6 liter flat-6 engine derived from the 1998 Le Mans winning Porsche 991 GT1 race car. The so-called Mezger engine is dramatically different than the normal Carrera engines. The engine is rated at 426 horsepower. The car features an all-wheel drive system and was available with either a 6-speed manual or a 5-speed Tiptronic transmission. It has revised styling and a wider stance than the naturally aspirated Porsche 996 Carrera models, along with new bi-xenon headlamps and a fixed rear wing. The Turbo also came with VarioCam Plus and stability management
In 2002, the X50 package was offered as an option on the Turbo that included larger K24 turbochargers and intercoolers, a revised ECU and quad-pipe exhaust which raised power output to 331 kW (450 PS; 444 hp). Other features introduced in 2002 were a glove box, center mounted cup-holders, an optional Bose stereo and rain-sensing wipers.
Between 2000 and 2005 less than 17.000 examples were produced.