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Its not that bad at all. If going EFI with out the turbo expect a torque drop due to the shape of the manifold. Also look at the r31 skyline for the injection kit. If you advance the cam timing as per the r31 skyline workshop manual add efi and a turbo it will be as good as it can be from an rb30.
Calaisturbo.com.au is a good site for Vls getting stripped out info