9ff's tuned Porsche 911 Turbo, dubbed the TR-1000, is reported to have hit a top speed of 391.7 km/h (243.4 mph) at the ATP automotive testing circuit in Papenburg, Germany.
The 9ff TR-1000 boasts a flat-six engine with larger turbochargers, an improved intercooler, sport camshafts, titanium con rods, crankshaft, a sport air filter, a revised ECU, and a high performance exhaust system.
As a result of these modifications, the engine is now able to produce 1000 hp at 7800 rpm and 1040 Nm of torque.
The TR-1000 can go from zero to 62 mph in 3.2 sec; 124.3 mph in 4.8 sec; 186.4 mph in 8 sec; and 223.7 mph in 16 seconds. Top speed is recorded at 391.7 km/h; however, 9ff believes that the car could exceed 400 km/h with improved aerodynamics.
For the car to remain stable at high speeds, the TR-1000 had several modifications. The revisions include a modest body kit with a front splitter, modified side skirts, a rear diffuser, and a rear wing, plus a high performance braking system, and an adjustable sports suspension with aluminum dampers.
Rumors have it that this conversion from 911 Turbo to 9ff TR-1000, which cost €130,000 or $186,900 USD, was done for a Greek millionaire's 25-year-old girlfriend.