Reliable 400 on a WRX is big money what ever way you look at it. Forged pistons as a minimum, and may as well do rods and replace bearings while you're at it.
SC42 or MD321T (overkill) turbo then you're looking at a six speed box and uprated clutch.
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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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