Im still here! actually in school....should be doing my work LOL.

ill comment on this in a min!!
(I would never do this)
My first question i must ask, why do you want to make it RWD?
unless you plan to drift there is no point and a slight down side. You are also going to spend alot of time and money doing this.

Some things to consider before doing this. If you keep the stock Diff! dont get bigger tires. Id get a R180 if i had 245's on the back, But you would be taking a big risk on the stock tranny. thats if you have a wrx!

One thing you need to realize before you want to do anything to your drivetrain. The WRX gears are plastic! and going RWD will put more stress on them!!!!

to sum things up! its a waste of money, time and labor to do this.