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Not that it will help....Japan. Most stuff will probably cost half what it does here.! I think that HKS keep quite tight control over the prices here, although some places may offer discount if asked.
Graham Goode's is your best bet.I have contacts in Japan and HKS or BLITZ dump valves are around 41000¥ add VAT+Import duty its not worth it.I can get Subaru and STI parts reasonable if interested mail me(air filters to alloy wheels)Delivery around 10-14 working days