Thanks for that buddy, but the HKS2510 is far to small.
I believe its slightly larger than a standard RB25 turbo, but in a BB version with steel wheels etc?
They are only good for about 200rwkw on an RB20 as far as I know.
Maybe someone with more experience can comment?
Has been said that HKS2530 is well matched to an RB20/25, maybe HKS2535 better for an RB25 these days.