autumn of 1983. The first prototype aroused enormous interest and in April 1984, Saab decided to put the car in production at Valmet Automotive in Finland. The production of the first 900 convertible started during the spring of 1986. The convertible usually had a 16-valve turbocharged engine, some with intercooler, but it was also offered in certain markets with a fuel-injected 2.1 L naturally aspirated engine from 1991 on. Influenced by General Motors (GM), in 1994 the New Generation (NG) 900 SE, based on the Opel Vectra chassis, was introduced. While this design contained styling cues reminiscent of the classic 900, the GM 900 was fundamentally a different car. For many fans of the marque, the GM 900 marked the end of Saab's technology-driven design philosophy and, in their view, the beginning of the dilution of the Saab brand. The cabriolet/convertible, however, was made on the 'classic' chassis for an additional year. In US and Canadian markets, commemorative versions were produced for 1994 featuring special charcoal metallic "Nova Black" paint, a wood dash, black leather piping on the seats and higher-performing engines. Engine development Saab introduced a turbocharger in 1978 in its 99 Turbo with the B engine (based on the Triumph Slant-4 engine). This engine was also used in early 900 Turbo models. For 1981 the B-engine was re-designed as the H engine, which was used through to 1993 (and 1994 cabriolets). Unlike the earlier version, the H-engine is very durable. Saab used Bosch-made mechanical K-Jetronic continuous fuel injection in the fuel injected and 8-valve turbocharged versions, and the Bosch LH 2.2, 2.4 and 2.4.2 and Lucas Automotive electronic fuel injection systems were used in the 16-valve versions. The 2.1 L inline-four 16-valve engine used the Bosch LH 2.4.2 EZK electronic ignition system with knock sensor. 1981 was also the first year that the Turbo was available with an automatic transmission. The four-speed manual option disappeared after this year. What set the 900 Turbo apart from its turbo-equipped competitors, especially in the early- and mid-1980s, was the development and use of the Automatic Performance Control (APC) boost controller from 1982. The system allowed the engine to run at the limits of engine knocking. The system had a knock sensor attached to the intake side of the motor block and if knocking of any kind was present, the APC-system would decrease the charge pressure by opening a wastegate, a bypass