Not necessarily louder, just a different tone. It's nothing like a big displacement V8 obviously, but it was choppier. It also sounded more aggressive around 3k rpm and up under WOT. I'm sure the headers played a factor there.

Sweet. This makes me want to get them installed. Trying to just stick to naturally aspirated but want more power hah!

Greddy made a limited number of these in 2018 and 2019, so they are not easy to find.

It is a very high quality performance exhaust that keeps the stock tone.
There's a bit of hiss with HFC or test pipes and some vibration anyhow.
I can trust Japanese parts quality standards.
They give good butt dyno results as far I can tell.

I get SO. MUCH. HISS. with my test pipes, but I've actually come to like the hiss. I guess I'm strange

This exhaust is not properly tuned for NA 370z. I always loved Greddy for the quality and proper tuning, however they haven't put enough R&D into Evolution GT exhaust to justify $1400 price tag. The combination of 3" piping size and design of mid and rear mufflers produce unacceptable amount of harmonic resonance. This exhaust drones through out the 2k-4k RPM range with such force that interior panels start to vibrate and produce sound. The drone is high with stock catalytic converter, and extremely high with ART pipes. For track use, its fine, for a daily driver it's terrible.

Ideally this exhaust would have 2.5" piping and or better mufflers to remove the droning.

I had it for 3 weeks on my car, , I drove it with ART pipes for 1 week then with stock CATs for 2 weeks hoping to like it, and I personally didn't. I thought of making a custom Y pipe with extra resonators to eliminate the drone. At the end I just sold it off.

If anyone has this exhaust that would like to sell it and maybe try something new please let me know I have paypal ready when you are