yeah i noticed a difference: smoother at lower engine speeds, and a lil quicker pick-up at higher engine speeds and WOT (wide open throttle), and i figure if you can hear the growl being more pronounced inside the cabin, then you have to be able to hear it outside.
next time you go through an underpass or tunnel, downshift a gear (or floor it for you auto tranny guys

) and let 'er rip! you'll somewhat notice how much louder the intake became.
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06 Flint Mica
~Current mods: Mod Express 6000k HID, TWM Performance shifter bushings, Eibach Sportline springs
~ Waiting on: Tokico Blues, strut bars, TRD Sway bar, Enkei RPF1 Special Edition Black