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The WRX 5 speed has a viscous type center and rear differential. The front diff is open. There are no adjustments for it. If you want an adjustable center diff to send more power to the rear you will need to get an STi or install the STi tranny into your WRX (expensive). The DCCD in the STi tranny allows you to change the power split with a knob on the center console.
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