I was looking at the GP pipes (EXCS-0006 US$477.75) + 2x Aluminium Silencers (EXSL-0005 US$26.25 x2) + shipping (about US$85)
about US$615 per set = about AU$800 +/- a few $$ depending on the combined shipping cost; it might be a bit less than that. 
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Jerry Lai
NSR250 [MC21SP]