I want to convert my RS to RWD, I have heard of center diff mods, but not sure what to do there. I am ready to purchase an 03 wrx rear driveline, diff, and axles, are those stronger enough to support a stock motor with only headers and an intake?
Don't bother upgrading the rear end...the WRX is the same stuff, with a less fun gear ratio. With all the power going to the rear wheels, you *probably* won't break anything stock, but you might. You will be losing all the advantages the RS has, FYI.