Horses for courses really, loads out there, how noisy do you want it?
Powergains are only really had if it's a de/sports cat and a remap otherwise just go for a backbox.
I had a TSL group N back box on mine for a while which sounded great personally save your money and go stage 1 (decat plus filter and 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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