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There are several out there - SprintBooster and Blitz Throttle Controller, are two that spring to mind.
Though these are just band-aid fixes, all they do it intercept the signals from the Hall-Effect sensor in the accelerator pedal assembly and adjust the modulation of the signal to the DBW solenoid. In a sense, you are amplifying the signal (pulse width control).
Swapping back to a cable actuated throttlebody will be more costly than the gains you'd receive from such a mod. Swapping to a different DBW thottle body will also not help anything, and you'll have to add a piggyback or go with a standalone EMS system to handle the difference in airflow. Gone are the days of tossing a bigger carb, now you have to please the electronic overlord as well.
The XRS reflash probably won't gain you anything, as far as I'm aware - the two drivetrains are identical between the Matrix S and Matrix XRS.
I haven't put off too much by the lag, you get used to it. Opening the throttle sooner just means more shock the drivetrain anyways - the couple of milliseconds that it response gain to your actions will easily be eaten up by wheelspin from tromping that go pedal. Though I do wish that Toyota tuned it a bit better, as their DBW implementation in their Lexus brands are superior to the Toyota branded applications.
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2002 Corolla S, 1.8L 1ZZ-FE VVT-i
2003 Matrix XRS, 1.8L 2ZZ-GE, VVTL-i (RIP)
2009 Matrix XRS, 2.4L 2AZ-FE VVT-i
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