So I'll let everyone know about the exhaust from nismo.
I was able to get my hand on a used one with +\- 1 year
And i love it but there is no sound increase or change. This one or your stock one sound just about the same.
Here is some picture of when i get it and how it look now. I will remove it in spring and clean it very well

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Im planning of removing the resonator just like the catback from nismo to make this thing louder.

I'll let you know how it sound