First introduced in 1975 the production 911 Turbo was directly derived from the cars used for endurance racing and used a 3 litre engine with a 4 speed gearbox. These were superseded in 1977 by the more familiar 3.3 litre version produced until 1989. With a larger intercooler and better brakes this Turbo was far more refined, however it had not lost the performance edge, with a healthy 300 bhp on tap the car still had the legendary turbo kick, hence the nickname 'The Widow Maker'. The result was nothing more than staggering as the car sold in the thousands, an instant classic it was the definitive sports car of its age. So in 1989 when Porsche announced the end of the 'true' 911 to make way for the launch of the 964 in 1990, a special commission of 50 Turbo were to be built with standard features previously only available as factory optional extras. This was to include rear wheel arch intakes, skirts and front spoiler (and oil cooler), reminiscent of the 935 Le Mans sports racing car. More noticeably was the fitment of a limited slip diff and an extra 30 bhp, making it the most powerful limited edition 911 Turbo ever built.