VIDEO: 9ff Builds World's Fastest Porsche 911 With TR-1000

DORTMUND, Germany — A video shows a 9ff-tuned Porsche 911 Turbo hitting a top speed of 243.4 mph at the ATP automotive testing circuit in Papenburg, Germany, effectively making the vehicle the fastest road-going Porsche 911 on the planet.

Dubbed the TR-1000, the vehicle is equipped with Porsche's standard 3.6-liter flat-6, albeit with a bunch of upgrades that bring output all the way to 1,000 horsepower and 767 pound-feet of torque. Engine modifications include larger turbochargers, an improved intercooler, sport-profile camshafts, titanium connecting rods, a forged crankshaft, a sport air filter, a reconfigured ECU and a high-performance exhaust system. A high-end braking system and an adjustable sport suspension with aluminum dampers are also part of the tune.

The changes allow the Porsche to sprint to 60 mph in less than 3.2 seconds and, as the video shows, eventually top out at an amazing 243.4 mph. 9ff says that further improving the car's aerodynamics could result in an even higher top speed closer to 250 mph.

German tuning house 9ff obviously had to tweak the exterior as well to keep the vehicle glued to the pavement at high speeds, so it added a body kit, front splitter, side skirts, rear diffuser and a rear wing.

9ff reportedly completed the conversion for a Greek millionaire's girlfriend, and it cost just over $186,000.

Inside Line says: 9ff is breathing down the neck of the Bugatti Veyron with its TR-1000, considering the French supercar tops out at 252 mph. — Mike Lysaght, Correspondent