Originally Posted by Davey

The Nissan S-tune is, I believe, pretty close to the NISMO's exhaust. I really enjoy the NISMO exhaust, it's not loud but you get a nice little "burble" at 1800 - 2000 RPM when you are cruising.

Since it's a factory option it's going to be very much on the conservative end. Just a little louder than stock. Actually it reminds me of the exhaust on my old 350Z, which also had that nice "burble" when cruising, unlike my first 370Z's stock exhaust which you couldn't even hear above the wind noise at 60 MPH.