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Well, Skyline GT-R owners upgrade to the Z32 TT pumps, as they are the highest flowing Nissan OEM pumps, and as you have written there, it's different than the Q45 pump and the NA pump (so it seems).
So if you were looking for a performance upgrade from the stock 240 pump, yeah, any one of those will work, but if you're looking for the highlest flowing pump, the Z32 TT one should be the one that flows the most.
However, your "??" doesn't really provide enough evidence to put this one in concrete yet.
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