Ill chime in for this one... after doing donuts in an awd grand cherokee, the CEL comes on pretty rapidly when things start goin hay-wire.
Subaru does not have such a sensor, and while your still able to do it, and use the ebrake. it is NOT a good idea
I used to do left handed and right handed smokey takeoffs and turning launches.... Until now
My rear diff blew up last saturday in the rain. while i wasnt doing donuts, or lockin up the ebrake... i have in the past
Wagner had it ordered, and ill have the car back on tuesday, when ill be plugging in accessport in the dealer parkinglot!
if you wanna do donuts, go rent a rear wheel drive car, unless you have a beefed up driveline, and plenty of power to keep the tires spinning at a high rate of speed.