Are you sure the gears are that low? I thought 3rd gear was good for a bit over 100mph. And I know that top speed is 177, but it's not redline-limited there, that's drag limited, so 177 happens at the power peak (6,800), I think. Anyways, I guess the C2 is geared lower than the GT3 if that's close - have to compensate for differing redlines though...
Thanks