ART pipes aren't meant to be louder. They're meant to maximize power and not be super loud and raspy like test pipes. The stock resonators and muffler will keep the whole thing quiet. If you added ARTs to an aftermarket exhaust you'd hear more of a difference.
If it's loud you want then regular test pipes are what you want.
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JAX GZ-R BC Forged
2016 Brilliant Silver NISMO 6MT
Past: 2004 6MT G Coupe and 2004 6MT 350Z
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