It is interesting to see where the local manufacturing costs have become too high to be profitable here nowadays. Years ago (early 90's) I had a look through GUD's manufacturing line and their testing facilities and was blown away by their commitment to setting a very high standard at the time. Although from what I understand they haven't manufactured here since the mid 2000's I understand they still have the testing faclities here greg?

I usually grab my filters from Repco (always buy Ryco where possible though) and to this day if you put a ROF (whatever number it is) against the equivalent Ryco Z30 the difference is immediate.

This is opinion only, not bagging anyone... I'm not sure about nowadays but the Repco oil filters always seemed of a lighter construction/not as much filter media back when they first came out. Recently I serviced my LS1 and couldn't get a Ryco filter for it so got a Repco one and it seemed to be not as heavy as the Ryco ones I'm used to.