It appears to me that the US model SVX is set up primarily as a front-wheel drive car, with an electrically activated rear drive.
I say front-wheel drive in the sense that rear torque split is from 50% down to the rear wheels, so the front wheels do most of the pulling and the chassis is set up to deal with this fact.
It may improve handling a good deal to use the JDM/Euro/Oz transmission. Subaru calls this the VTD-AWD System, it is fitted to pre-98 twin turbo Legacys and to the SVX[Euro and Japan type]
Anyone serious about Auto-X and needing to negate the understeer might do well to try and fit one of these boxes.
The Verion L I have in England is now supercharged, plus it has the factory active rear steering, which comes with a faster steering rack. It would be interesting to run this car against a standard [or modified] US car on an Auto-X course, to see if the chassis, rear steering and handling would knock off a few seconds.
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