Ah yes, here we are.
GT Motorsports: G37S VVEL Twin Turbo, 4.5L Stroker, MoTeC, SEMA '07 Project Car - MY350Z.COM Forums
For a brief moment, GTM was marketing this GTM/HKS turbo kit that was based on the HKS turbo starter kit I spoke of. They didnt market this much long at all before they had their own manifolds for their own GTM kit.
Judge for yourself, but looks the same to me. Anyone feel free to correct me if I am wrong, but based on what I am seeing, I am pretty sure that the only parts they engineered in their turbo systems were the intercooler pipes and wastegate pipes.