if hes just looking to do the work himself youll need:

60-1 or a 62-1 turbo IMO
XS power manifold, they run $200-300 an work fine under 600whp
Id reccomend a good quality wastegate like a Tial 44mm
BOV, i have had success with the HKS , even some guys had EBAY ones with no problem

Id make sure you have AT LEAST a AFC to tune with, they can support 550-600whp no problems.

youll need to have the other shit like a front mount intercooler, piping, exhuast as well to really see the full benefit