Depends how good the porting job is, my old Harvey ones (with a Samco inlet) gained me around 400rpm earlier spool so it's possible you could lean out over that period and even beyond without them being mapped in.
Might be better to try and get a spare set to port and then swap over nearer the time.
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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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