That power is spot on for a VF39/VF43 and a conservative tune. Exhaust diameters don't make more power, they just permit it. Muffler design is just as important as pipe diameter, if not more. A 2.5" Stromung exhaust is less restrictive than a stock 2.5" STi catback for example.
I do not recommend going to an EBC at all personally, and you 100% will need a retune if you do. The reason the boost tapers off is the STi turbo isn't really big enough for the 2.5 liter engine, and there's nothing any tuner can do about that. An EBC can improve spool up at lower RPMs to a small extent, but it doesn't help the top end. You need a bigger turbo or better fuel for that.
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FWD is the new AWD
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