That's nearly that ! 335km per hour that's in 2003 but Jan was faster with the Dome in 2002 during testing just before Mulsanne. He had a speed of 214 miles per hour that correspond to a speed of 344km/h.....
The Dome S101 has a very good aerodynamisn which explain its very high speed but compared to other cars the Dome was slower in turns that's why the Dome never did the pole position...