Get yourself an AEM Intake or Carbonio. You can find s/h ones on vortex shipped to AUS for under $200 and they are definately worthwhile as it will look a lot neater and fit a lot better.
otherwise you have what everyone is mentioning, exhaust (milltek), you can also get head/cam work as well amongst other things... it'll sound as a vr6 with an exhaust!
bugracer on here is probably the most knowledgable when it comes to these engines imo.
http://www.youtube.com/watch?v=N-YQ-djJmRU v5 golf video/audio
(turbo bora)
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