Not entirely true.All engines are possible candidates for HG failure,however not all engines are 80% likely to need them at or around the 60,000 mile mark every time.I love subaru,i am a mechanic and one of my best friends is a purely sube mechanic with 20 years under his belt.The problem has nothing to do with improper head studs or the wrong coolant,it is a matter of heating and cooling cycles - period.Someone who makes long commutes will get more time out of there Hg's than someone who drives 15 min's and then shuts down (or the normal joe).The dimensions of the block,cylinder bore ect ect are to blame and you wont fix it permenantly.Anyone who says they have taken care of the problem cant really say so until that engine has 60-70k on it after work is done.I realize in the performance world this mileage is nothing, just letting people know that there is an issue and it is epidemic with these motors.I know of many 2.2 and 2.2 turbos that have 2-300k with original Hg's and are going fine, and they are nearly as bomb proof as the old ea series motors.Yes there are freak 2.5s that do great but if i was going to do the swap it would be 2.2 all the way.Go ask some folks at USMB what they think of the HG issue.I can just imagine what happens when you boost a run of the mill ej25!!