For the level of mods you're talking about especially keeping the downpipe cat I'd just get the std ECU mapped, either ECU-Tek or open source - I use Simon and have only ever had/heard of good experiences with him, there are a few other well respected guys about.
I'm running syvecs now but only for the additional functionality it gives me - the car was running 370BHP on an ECU-Tek map without any issues (until I blew a bearing!)
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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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