Hate to bring this up but mines doing exactly the same but it looks like mine is the head gaskets!
It's either the rad cap gone and allowing the water to boil as its not under pressure the pressure pushes water out and you have a full overflow tank and a half empty header tank.
Or as it looks in my case, the H/G has gone as the combustion gases are passing it into the coolant over pressuring the system and causing overflow and an almost empty header tank.
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2005 Spec B 6MT - KiDO tuned (~270Bhp)
Custom exhaust - Cosworth filter - Samco Intake - Tints - Bilstein B8/B6 & STI springs - SuperPro ALK - Whiteline positive shift kit, rack mounts, rear adjustable camber bushes, front ARB mounts & strut brace, 20mm rear ARB with AVO mounts, - Hardrace Gearbox and pitch mounts - Prodrive PFF7's - Front Brembos - Kenwood CarPlay - 1/2 carbon grille - STI front splitter
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