272 km/hour, that's nice!

I always wondered how fast a stage 3 cossie would go. With longer gearing it might have even gone a bit faster.
BTW, do you know what the rev limiter was set at? I believe mine is at 7200 rpm on the MSD chip. With 215/40 R17 tyres (don't know what you had) it should do 273 km/hr at the limiter in 5th. With the 5th gear from a MT75 diesel (0.76 ratio) it would be limited to 298 km/hr, assuming it would have enough power to pull that of course.