In fact, that 670hp figure beats even the Mercedes SL65 AMG Black Series in terms of overall power, and the GT2 is considerably lighter. Acceleration in the 9ff GT2 is brutal: 3.6 seconds to 62mph (100km/h), 9.8 seconds to 124mph (200km/h) and just 25.8 seconds to 186mph (300km/h) – faster than both the Ferrari Enzo and the Porsche Carrera GT.
The V670 turbochargers are only part of the story, but they are an imporant part. A custom 9ff air intake manifold helps the turbos breathe, while in-house designed and built racing headers and exhaust system helps flow through the engine. A custom valve on the exhaust allows the driver to choose from a tamer near-stock sound level or a wide-open race car sound for track use. An ECU tune and raised rev limiter to 7,200rpm finish the engine modifications.
Source: Motor Authority