I have a 14 Nismo. I added an HKS Hi-power exhaust for a notable improvement above 3k all the way up, drove it for several months then added a Nismo R-Tune long tube intake with notable improvement above 5k. I think you jumped the gun on the tune. Until the engine can breathe more freely it will be difficult to make any significant improvements.
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2014 370Z NISMO -- HKS Hi-Power Exhaust -- Swift Springs -- BC ER Coilovers -- SPL Suspension Components -- Nismo R-Tune Intake -- Seibon BD CF Hood
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