The Saab 906 Turbo was a one-off six-wheeled estate conversion built in 1986 by Leif Mellberg, a Swedish coachbuilder based in Nyköping known for individualized car conversions. Mellberg had earlier gained attention for a 1982 conversion called Blue Spirit, which transformed a two-door 1976 Saab 99 EMS into a gullwing-doored coupe. He held a distinctive reputation among Swedish custom car builders and was referred to as the court couturier of the Saab Car Division.
The Saab 906 Turbo was built to customer order from a Saab 900 and featured six wheels and estate-style bodywork. Its underbody was lengthened by 60 cm, the roofline at the rear was raised by 12 cm, and the fenders were widened by 9 cm at the edges. Mellberg gave the car a slanted front grille, a styling feature later adopted on the standard production Saab 900 for the 1987 model year. Other exterior changes included a front spoiler that extended into side sill extensions, decorative color striping beneath a raised, enlarged third side window, and ventilation slits in the rearmost roof rail.
Behind the rear seats was a 190 cm long load area, and the interior was upgraded with leather trim, a television receiver, a small onboard computer, and an audio system with 16 speakers. Similar six-wheeled special conversions were also produced elsewhere, including in Germany, during the 1980s, but Mellberg's design was considered particularly accomplished and has been classified as a concept car. The conversion took Mellberg 1200 hours of work to complete.
