From the video, it sounds like it (they?) were already broken. Possibly from the previous launch? Either way, they're toast.
Somewhat surprised you got it to hook enough on those 18"? rims to do that.
8.8 Here, with porsche 930 CV's, 31 spline inners, 29 spline outers (240sx) and Its holding up great. Don't know the power the car is making, but it traps 150+, and cut a 1.400 60'.