The GT-R fuel pump module wouldn't fit in the Z since it mounts to the floor of the fuel tank in the r35, where the Z does not have the mounting flange on the floor of the tank since its module hangs from the 6 bolt flange on the top of the tank.
But I have a feeling that you are asking if the pumps removed from the r35 module will fit and if they are any better... In which case, I don't know if the flow data is available to compare, I've never seen anything solid on the Z pumps actual output. But whatever it is, it's not too shabby and I'm not sure if I've seen anyone need to upgrade it without forced induction or e85.
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