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I dont know what is the biggest dimension we can go but i will take mesurement to see if the nismo exhaust is bigger. They seam to be the same

The inlet is the same but the tip is not. Ill get the resonator out and see what i gain

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...