It's interesting, as I would have thought a semi-enclosed dual cone would be much louder than a fully enclosed airbox.
I'm in the South East mate, what about yourself? I think there's a 1M meet being organised in the Vic forum if you're keen. Mine has to go into BMW tomorrow for some diagnosis due to water getting into the boot, so hopefully it's back up and running in time. Would love to see what the AFe sounds like first hand.
I've owned a couple of 180SX's myself, love the S-Chassis