As said problem with the 2.5 is head gasket and ring lands. You can check at the time there ok, but nothing stopping them from failing 10 miles later. Personally if i was going for a hawk sti i would budget to drop in a set of decent pistons and rods, headgasket and head bolts. Takes away all the issues they have, but doesnt come cheap (prob 3k-4 Assuming all other parts are ok.)