remember your gt30 , is a bit on the small side ... the compressor housing is to small, thats why you make so much power so low down, and why youve done two gearbox's.. itd be worth imo, chaning it for a .084 or .096 maybe even a 1. something depending on when you want power to start .. may as well do it whilst the engine is out.. youve got some stuff to sell, so not all bad.