As far as I know the STi cats are the same as the WRX unless it's a PPP downpipe with sports cat. the up-Pipe could be a good move as it'll decat but beware some are too large a bore and actually adversely affect spool. Prodrive box is a nice piece of kit, free flowing but quiet and subtle.
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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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