Unless she has DCCD, (which she wouldn't have being a WRX) she would have permenent AWD,
I wouldn't imagen the engine/clutch would be able to overpower the centre diff!
So she must have been converted to RWD
I can drive on the road at about 40kph in second gear around 3,500rpm, Hold the brake with the left foot and right foot to the floor on the throttle, boost builds
Let off the brake and the 4 wheels light up!
If it can do that, surely it would spin up the back while on the brakes!
So, must be DCCD which has a clutch type centre diff that splits the torque front/rear
Or somehow converted to RWD,
I don't know if just removing the front shafts would achaive this? as far as I know, the non DCCD will have a viscous centre diff, which will always have an element of slip, so I assume the if you just removed the front shafts, then there would be power loss there,
Dan