You won't hear the difference in the exhaust note unless you get on it hard and tach it up past about 3300 RPM's. After that, you should hear a pretty noticeable change in the sound of the car compared to it's pre-ZTube days.
If you really want to hear the difference in note, you'll want to have the windows rolled down, and maybe even try it next to a building or while under a bridge. It's not just that the car is slightly louder, but it actually has a completely different note at higher RPM's.
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-2004.5 6MT G35 Coupe, Diamond Graphite/Graphite, Aero, Premium, Nav, Splash Guards, Aluminum Pedals, Z-Tube and K&N Air Filter, 3/8\" Motordyne Plenum Spacer
-2001 Toyota Tacoma SR5 Stepside 5-Speed 4X4 with siderails, Tonneau Cover, Bed Liner, and Rain Guards
-1990 Nissan 240SX SE 5-speed with some minor mods
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