They usually fail as exhaust to water - check for bubbles in the overflow tank or do the washer test!
Get the engine up to full operating temp, take the overflow hose out of the tank and add a length of hose to it so that it pokes out of the bonnet in view of the driver or passenger then go for a drive and put the car under heavy load to really spool the turbo up to full boost for prolonged periods. If the hose squirts large amounts of coolant when under boost it’s almost certainly a HG issue (cylinder to water jacket).
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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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