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With stock twins ecu tune/stock throttle mapping torque dip is there, i doubt there any games are played regarding that (otherwise i'd expect that to be hacked around/"fixed" by throttle remap in MY2017, as many complained about it in past for twins). But yes, throttle mapping is not linear, and judging by how it's done, imho game that is played in stock tune is to make impression of having larger engine, by actual throttle opening much steeper during first part of pedal travel. That doesn't affect so much how immediate throttle response is though, drawback being less fine low-medium open throttle control to pay for that bigger engine faking.
Still, as i already mentioned above - supercharging might be considered as option. It won't change a bit throttle response, which will same exactly same as in NA. With SC engine should behave same as NA except generating more power, like if engine had been NA but of bigger displacement (at cost of less efficiency due gearing/pumping losses from driven by engine supercharger, instead of more efficient turbocharging that is driven by recuperated energy of exhaust gases).
But imho lag of well done turbo setup that isn't concentrated on max output, but instead on little lag/quick spoolup from low rpms with single turbo optimized for low rpms or twin turbo (STI's setup is not such in my eyes, rather set for max power from engine, mostly at top) can be rather responsive, and you might be trying to avoid such too undeservedly.
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