The 07 XT and 08 WRX in the United States both use the EJ255 and the EJ255 was also used in South Africa as well. So it's likely that the your friend's xt and your WRX share the same motor therefore you should be able to directly transfer the BOV. I can't confirm this but it seems likely. XJman's advice about being fully recirculating is important to not however if the tuner can safely tune for it, by all means follow the tuner's instruction.