My 2002 Bugeye WRX was at 270 on a Miltek 3' Sports Cat system and de-cat up-pipe with a panel filter, 3 port Solenoid and Walbro 225 fuel pump.
In your case I'd look for a used STi Up-Pipe (if yours has the cat in the up-pipe) and PPP downpipe.
It would also make sense to possibly look into fitting a VF34 or 35 turbo from an Sti along with pink injectors as fitting the up and downpipes you may as well change the turbo to reduce the labour charges. So live with what you've got for a bit and change the lot in one go to save on doubling up labour charges (you could skip the injectors for a bit and just do the turbo but then you'd need a further remap).
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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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