I would use it as is....
I mean try and if no good then swap em over....
There is just too much hear say on these topics....
I was told a standard r33 turbo on an rb20 would not produce a cent over 180rwkw and i got it too 230rwkw.... So who know's????
I would take Bretts advice as a starting point but if your un happy with the results you can always change it....