It is also said, but not verified, that Hamann Motorsport's Phantom package also includes an engine kit that boosts the 6.75-liter V12's output from 460HP to 535HP and maximum torque from 720Nm to 835Nm (615-lbs/ft). Along with the removal of the speed limiter, it is claimed that both Phantoms reach a top speed of 300km/h or 187 mph.
Via: Autoblog.nl