customs are not muppets unfortunatly, even know a turbo from a toaster and what there worth.
ive imported quite a bit from the states personally and from tuning companys for 5 pot Audi motors and i have had everything caught up at customs EVERY time, even 10x mikalor style hose clamps for $3 + $12 postage (only parts taxable) right upto 034 motorsport top spec ECU for $3000 IIRC
pity, no loopholes to jump through now, even bringing stuff in personally, so much is checked you wouldnt belive.
****when i got my Turbonetics T61 i paid less duty on the turbo than i did for 2x wastegate springs in a package that arrived 3 days later, mugs