Maybe switch out the resonators? I did a small experiment and went and bought a G37 midpipe and G37 muffler. The G37 resonator section in the midpipe is longer than the 370z resonator, it gives the Z a growl now everytime I turn on the ignition. You cannot hear the difference TOO well in-cabin (slightly, you can hear it slightly different), but when you go inside the tunnels, it sounds like a lambo (in my opinion). Very aggressive.
I decided NOT to install the G37 muffler because the noise was like a hybrid between the 370z exhaust noise and the G37 exhaust noise. It's what should have been in the first place.
total cost: $160
As far as noise goes, it's SLIGHTLY louder or rather, more noticeably louder. I wish I could compare it with the stock exhaust noise, side by side.
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