It was the front uni joint that let go.
I was lucky, you need to have a tailshaft loop at the front so it hit that. The rear then snapped and the tailshaft exited the car just on entry into turn one at the Creek.
It made little damage to the car, I was very lucky that the gouge the shaft took out of the loaded right rear tyre wall didnt go all the way through and that I didnt have a blowout whilst doing that speed.
Im afraid it would have been the end of poor old EVO5 and myself if it did go through the tyre wall.