Okay, two things.
First: the S-Tune exhaust is a joke, it doesn't add any appreciable gains and I don't think it sounds very good.
Second: If the OP is talking about the OEM Nismo exhaust, it's a great option to add power without adding noise.
Let me be clear, it is NOT appreciably louder than the standard OEM exhaust. It will add double digit horsepower gains, though.
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