|Products||Automobiles, Automotive parts|
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.
9ff have made the following models
- 9ff T6
- 9ff GT9-R 
- 9ff Speed9
- Speed9 (version 2)
- 9ff GTurbo 1200
- 9ff GTurbo 750 
- 9ff GT9 Vmax
- 9ff GTronic 1200
- "9ff — Autoblog". Autoblog.com. Retrieved 2010-07-03.
- "9ff cars". Top Speed. Retrieved 2010-07-03.
- "Records & Milestones". 9ff. Retrieved 31 January 2012.
- "9ff Fahrzeugtechnik GmbH - Best technology for the best performance - Products". 9ff.com. Retrieved 2013-10-20.
- Nick, By (2008-03-25). "First Drive: Porsche 9ff GT9 review (2008 model) - MSN Cars UK". Cars.uk.msn.com. Retrieved 2013-10-20.
- "SpeedART Declares Bankruptcy, Blames it on Porsche Lawsuit, 9ff Also Files for Insolvency". Carscoops. 2013-09-18. Retrieved 2013-10-20.
- p1800 wrote: (2013-09-20). "Why are so many German tuning houses going bust?". Autocar. Retrieved 2013-10-20.
- Text: David Vivian / Photos: Chris Rutter (2009-02-04). "9FF GTR9 | Car Review". evo. Retrieved 2013-10-20.
- "9ff Fahrzeugtechnik GmbH - Best technology for the best performance - Willkommen bei 9ff". 9ff.de. Retrieved 2013-10-20.
- "9ff twin turbo GT3 RS road test review". evo. 2010-06-11. Retrieved 2013-10-20.
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