Not sure about buying in Australia but you dont have to change your filter really ever unless it is damaged, you just have to clean them with KandN's cleaning kit every 20 or 30k miles depending on the driving conditions you face (dirt, dust, etc.)
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2010 Base+Sport 6spd: Stillen G3, FI Non-Resonated CBE, FI Non-Resonated Test Pipes, UpRev Tuned, Custom 24R Oil Cooler, JDM Rear Fog-OEM Harness.
???Whp ???WTQ (Will find out come spring time)
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