Go a big single...T78 or T88 get the smaller version though the T88-33D you will see boost Around 5400-5600rpm On the stock motor...Although 272* cams were used, cooler, etc etc...
Mods would vary when the turbo comes on...
Its a simple set up you can get one between $4500-5500 depending on condition...
And you get the awesome wastegate scream
As for the power you will easily pull over 400KW@all 4 wheels considering the mods etc....