I just dont understand this one bit!

AK370Z

Difference Between Regular 370Z exhaust vs Nismo 370Z exhaust - Nismo 350Z / Nismo 370Z Enthusiast Community

You're confusing yourself and going to dealer don't help. Most dealers don't have the correct info but that's why we are here.

There are TWO Nismo exhaust.

a. Waldina Nismo Exhaust: This is also known as S-Tune package Nismo exhaust. I believe this is NOT a true dual setup. This is a bolt on part for regular Z.

b. Genuine Nimso exhaust: This exhaust is from regular Nismo Z. This is dual exhaust. The exhaust hangers may need to be changed to put this on regular Z.

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