I thought the 04 STi had a lateral G sensor and the 05 had a Yaw rate sensor instead.
I'd go with the aftermarket controller. Trying to figure out if signals are incompatable without some inside knowledge sucks teh c0ck. Plus the ability to customize how your Diff reacts would seem to fit your use of the car better.
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Dan - '05 Black WRX STi.
My Mods
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