Sounds like the spring is too weak allowing it to open under boost. It's generally accepted that the OE valve is the best option on moderately tuned cars.
Have you got a keypad in the car from your alarm (usually in the fuse pocket bottom right on the drivers side of the dash) if so you have the sigma alarm which I had a manual for somewhere.
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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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