There's a reason German engineering is considered one of, if not the, best in the automotive world. It's because you have some of the world's greatest engineers devise a vehicle like, say, the Porsche GT2 and then, along comes a tuner like Dortmund-based 9ff, with its own crew of lab coats, and "optimizes" the results.
The head of that team is 9ff owner Jan Fatthauer, who himself oversees development, and with extensive modifications the 9ff GT2 670 reaches a maximum horsepower of 670 (hence the name) and top torque of 800 Nm (that's 140 and 120 more respectively compared to the serial model).
The engineers (we can call them lab coats. lab rats, or worse but we have to be respectful here, after all, they're the ones who make these machines we love) call the tweaks they put to the specially constructed V670 turbochargers "variable turbine geometry". What does that mean?
* Air inlet system with 9ff manifolds
* In-house racing headers
* 100-cell sport catalytic converters
* Titanium mufflers with driver-adjustable sound
Yes, the driver can adjust the sound from a "close-to-production" sporty sound to a "powerful" racing sound, which one has to take to mean very loud. They've also done some jimmying of the clutch and suspension. You can read the press release for those details.
Final numbers: 0-100 km/h in 3.6 seconds, 0-200 km/h in 9.8 seconds, 0-300 km/h in 25.8 s.
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