The Big Car Database


9ff is a German car tuning company, based in Dortmund, founded by Jan Fatthauer in 2001, specializing in converting stock Porsches into street legal racing machines, either as fully tuned cars, or selling individual parts or kits. 

They are best known for building one of the first cars to exceed 400 km/h (249 mph) - the GT9, which is capable of speeds up to 256 mph (412 km/h). The former company, 9ff Fahrzeugtechnik GmbH, filed for bankruptcy in September 2013.The 9ff Engineering GmbH, founded in October 2013, continues proceedings.


Industry Automotive
Founded 2001
Headquarters Dortmund, Germany

Key people

Jan Fatthauer
Products Automobiles, Automotive parts


9ff have made the following models

  • 9ff T6
  • 9ff GT9-R
  • 9ff Speed9
  • Speed9 (version 2)
  • 9ff GTurbo 1200
  • 9ffV400
  • 9ff GTurbo 750
  • 9ff GT9 Vmax
  • 9ff GTronic 1200