boo yea for a almost 5 year old thread.

 

i was able to fit 18x9.5 +40 with no issue just a fender roll and KW coilovers.
tires are 255x35x18

 

ended up parting ways the with the WRX, not until it had 255/35 Falkens on it. Coilovers, camber plates front and rear, and a fender roll. Only rubbed on the hardest of corners.

Now have a 2007 Forester XT, going the same route with some 18x9.5 et30, 245/40 and a fender roll.