Ok have forged 2.0 engine v2 ra heads 7500rpm.740 injecters,rc equal length header's.fmic,6speed box in classic RA.
thinking of getting mapped with md555 460-480 bhp turbo
what sort of torque could i expect from this running on just vpower only.

ie, what clutch will i need

Thanks

 

I think your v.1/2 WRX hydraulic heads will give you issues as you approach 400bhp! The power will tail off and generally do weird things as you approach the redline, I think.