Who mapped the car - if they were a know Subaru mapper rather than an all makes chipper then I'd doubt that the car is slower unless it was mapped too close to the limit!
My last remap took my Impreza from 445 to about 431 as a greater safety margin was put in as I was too close to the limit of the MAP sensor. If you map too close to the limits you risk reliability issues or total failure!
Most mappers won't touch an EBC as the ecu will do as good a job anyway when mapped properly and the EBC could take the boost outside of the ECU parameters and mess up the fueling etc.
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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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