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i have a turbo from an 89 nissan z32 300zx with the lines and dump pipe turbo is in good nick asking 250

Let's save everyone a lot of hastle and angst. Ardnin (or rather his mate) is clearly after a VG30DET turbo, which is roughly the equivalent of an RB25DET turbo. Your VG30DETT turbo (notice the extra 'T') is roughly the equivalent to an (ie one) RB26DETT turbo. Bolting a single VG30DETT turbo to an RB20DET is, in my experience, not generally regarded as an 'upgrade', not to mention the fact that it would be difficult to do since it has a smaller exhaust manifold attachment flange than the stock RB20DET turbo, which is why a VG30DET turbo is needed because it more or less bolts straight up.

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