Your car is quiet because the stock Nissan exhaust for our cars is a joke. It is by far, the biggest let down with the 370Z. It is even quieter on the Nismo model. My '17 Maxima has a louder stock exhaust. Nissan completely dropped the ball on the stock exhaust sound.
Having said that, you need to avoid the "short tail" type axle back exhausts. They are horrible in my opinion and you usually end up with unacceptable amounts of drone, buzzing and resonance inside the cabin. If you want a slightly louder and better sounding exhaust without significant drone, you need to go with a complete axle back that is properly designed to include proper x or h-pipe, mid pipe resonators and true mufflers after the axle. You can also read reviews regarding drone to ensure you pick the right one.
Please be careful choosing because what is quiet for one person can be unbearable for another. Choose wisely and remember, drone does not normally show up on Youtube exhaust reviews.
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"That’s when you know you’ve found somebody special. When you can just shut the f*ck up for a minute and comfortably enjoy the silence.”-Mia (Pulp Fiction)
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