In all honestly there is little you can do easily in the way of tuning. You may not have the burble either as the N/A's have equal length manifolds.
For the burble you need an unequal manifold (Borla replica).
Basic inlet/exhaust tuning will see some gains, air filter and freeer flowing exhaust (remember you need some back pressure on N/A systems)
Next up is head flowing and porting plus Cams which are not cheap!
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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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