gearbox == r32 gtst 5speed, tailshaft== something that fits... (previous owner did conversion)... the diff is a bit of a unknown either way.. its locked 99% of the time /
127rwkw is around 170rwhp thats not to bad for your mods considering thats pritty much stock.. you'd get better horsepower out of a 3inch mandrel bend turbo back exhaust 10psi is factory... front mount intercooler and also a solid intake pipe (turbo to afm)
and yer that should get you goin around the 160ish maybe a little bit more rwkw