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The 9ff GT9 is a sports car based loosely on the Porsche 911. It's built by German tuning company 9ff, founded by Jan Fatthauer. The base car is a Porsche 911 (997) GT3 which is extensively rebuilt and fitted with a heavily modified 4.0 litre H-6 that produces 987 HP. One of the major differences from a normal 911 is the positioning of the engine. While every 911 throughout Porsche's history (except Porsche 911 GT1) has been rear-engined for maximum rear-wheel grip, the GT9 is mid-engined for better weight distribution.

It takes the 9ff 2.4 (with roll out) or 4.2 (from a standstill) seconds to reach 100kmph (62mph) (2.5 for the Bugatti Veyron), and 17.6 seconds to reach 300kmph (186mph) (0.6 of a second faster than a Veyron). The top speed is 408kmph (254mph).[1]

The car weighs 1326 Kg and has a 6 speed manual transmission.

The interior of the car has been stripped out for lightness and is very basic compared to a standard 911 Turbo, with a blue leather, square patterned trim. Inside it has a roll cage for safety.

9ff has stated that only 20 conversions will be made at a cost of approximately £350,000, all of which have been sold.