From a small amount of research it seems like the Steam Speed turbo kit is yet another Greddy knockoff turbo kit. I can't answer for the quality of the manifold/turbos they use, as SBD has been the leading Greddy clone for years, but I do know a local shop to me also swears by Steam Speed for their other Subaru applications.
My advice:
Either email Steamspeed and ask about their hot parts and turbos, maybe find out who makes them or where they are produced
or
Consider other turbo kit options; I personally recommend Revworks, JDL, authentic Greddy, or HKS. RW and JDL both make their hot parts in house and use name brand quality turbos, while Greddy/HKS will provide you with that JDM-ness you may or may not be craving.
Good luck
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