These cams arent AVCS, so they shouldnt have a problem.
Something to think about they are designed for the 2.0L (different Lobe seperation). They will work with a wrx/STI combo, but not to the fullest potential a cam could offer for a 2.5L application.
Helix cam lift= .377" stock USDM 2.5L STI cam lift= .380"
so for a 2.5L you arent gaining airflow, but you should get a better powerband.