I am not in understanding. Do you want to buy The 3037 or the GT30R. They are different turbos. They are similar, but one is an HKS (older) and then theres the brand new top of the line Garrett. I dont know if you can get the 30R in a 52T, if that's what your asking. I know they make the 3037 in a 52T. Couple that w/ a .73 turbone housing for a bad ass turbo.