Compared to stock settings what will I notice most once toe is set to ZERO front and back? How does toe affect the cars charactger?
I'm still a road course newbie so is this toe setting even recommended? When spring time comes back around I plan on going with a more aggresive alignment settings anyway. More camber front and rear.

 

Front Toe in ads stability, but slows turn in
Front Toe out makes it "darty"
Rear Toe in increases understeer
Rear Toe out - don't do it.

 

The alignment specs I see many people running on the WRX is a little bit of toe out on the front, zero toe on the rear, negative 1.5 to 2.0 camber front, negative .75 to 1.50 camber rear. Keep in mind camber won't make for much tire wear, but I don't recommend driving around daily on toe out, so if you go with toe out for the track, be sure to change it back for driving on the streets, unless you like replacing tires every 5,000 miles. Best of luck on the track in the future!