The 9ff GT9 is a sports car based loosely on the Porsche 911.[1] 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 750 to 973 bhp (560 to 726 kW; 760 to 986 PS).[2] 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 4.8 seconds (with roll out) or 5.1 seconds (from a standstill) to reach 100 km/h (62 mph), and 34.9 seconds to reach 300 km/h (190 mph).[3] The top speed of the 973 bhp (726 kW; 986 PS) model—which weighs 1,326 kg (2,920 lb) and has a 6 speed manual transmission—is 409 km/h (254 mph).[2][4] which is faster than the original Bugatti Veyron but slower than the SSC Ultimate Aero TT and the Bugatti Veyron SuperSport.
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 stated that only 150 GT9s would be produced, and only 20 of those would have the most powerful engine. Prices ranged between £150,000 and £540,000 depending on engine and options,[4] with all of them already sold.
The 9ff GT9 is being replaced by the GT9-R, offering up to 1,120 bhp (840 kW; 1,140 PS). The engine is available in 3 stages from 4 to 6 cylinders and can be upgraded at anytime. It has been designed to take the speed record for a street legal car with a claimed speed of 414 km/h (257 mph).[2]
It does 0–100 km/h (62 mph) in 2.9s and 0–300 km/h (190 mph) under 16s.[5] As with the original GT9, only a limited number of GT9-r will be produced and only 20 with the largest engine.[2]
Before the GT9-R top speed was independently verified, the Bugatti Veyron Super Sport achieved a record top speed of 431.072 km/h (267.856 mph).