I believe the only difference is the newer models have direct injection. Although the manufacturer claims it's still 332hp and 350hp for the NISMO, some have stated, including Z1, they typically dyno slightly higher. I personally have seen no evidence of this. I have a 2009 and my dyno numbers have been very surprising. So if you own an earlier model and you're concerned with this, don't waste your time being discouraged.
Just my $0.02
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~Rob 
-DD Air Guide, Stillen G3 CAIs, 63mm Throttle Bodies, Motordyne M370, Berk HFCs, FI TDX CBE (non-res, CF), Sprint booster v3, Ecutek Dyno Tuned, and the list goes on...
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