Have any of you seen the new High Efficiency filters ryco sell? They are really good. They are higher in quality and have more filtration and still have the anti drain back but in a more efficient way.
Heres one from Supercheap. This filter is not really for subarus but they are slowly rolling out more HE filters for different cars. So far they have Ford, Holden, Toyota, Mitsubishi etc
http://www.supercheapauto.co.nz/online-store/products/Ryco-Platinum-Oil-Filter-Z386HE.aspx?pid=340001#Cross