Mate has a 172 Cup (brought for his missus but he's quite keen on playing with it) He's had it flat out at 145mph on the clocks and it wouldn't go a jot faster 2 up. Take off a minimum of 10% for the innacurate sppedo and he'd be looking at just over 130mph which would seem reasonable to me.

150mph he is in cloud Max Power land with all the Saxo West Coast drivers