Hasn't anyone considered that MRT sells straight cut gears that fit in our case syncro free for around 3500$. They work with you on gear ratios, and have gearsets for quarter mile.(which is wierd since they don't measure in miles. So to any non-american out there, what is quarter miling called, elsewhere?)
The reason I mention this is that they get 12% or more hp increase to the ground just because of lower friction.
And feel blessed, the Porche GT2 2WD tranny is 15000$US. And Supra's racing boxes are up toward 20000$US