I wouldn't venture to say much. I've yet to really see where a tune has given substantial results. Most get 5-10hp at the peak and maybe 10-15 under the area of the curve. However on the NISMO, since it already comes tuned from the factory, I would say you'll gain even less. Personally not worth the money to me, but again that's my thought. Then again, you spent how much on your mods and probably only gained 30hp. I mean cost per hp on this car isn't that great to begin with so I guess it just depends on what you are willing to spend to get the max hp.
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