Hah!
Westside eah...
You will be welcomed by the the Nissan Sideways (Nissan Silvia) members and there are quite a few SAU members out there as well.
1 intake mod only in VIC, so if you got an air pod, not allowed to have a front mount intercooler.
If you got a front mount intercooler, no air pod allowed.
It you got both, box up your air pod.
exhaust, just keep it quiet and you will be fine.
height, keep it above legal limit (100mm I think) you will be fine.
Drive responsibly and stick to the law and you will be fine.
Welcome to Melbourne!