As per turboedsloth comments. Mine blew 3rd when already in gear and putting load on coming out of corner. Not stronger than GTR gears and ratios help for staying on boost in 2nd at 4000rpm and 60km/h.
Probably okay for 600hp on road tyres, but not 600+kW on full slicks.
Also only 70% engagement on spline of front twin plate clutch plate.
I used Redline Shockproof medium weight oil.
Looking at Samsonas option now.
Cheers