James,
This is definitely the appropriate thread to reference Rob Frink's diverter valve with integral
oil filter housing. I actually have seen his device first hand and it is top shelf stuff. But I backed-off installing it for a couple reasons (mostly, my unwillingness to re-route the lower radiator hose and replumb everything with -12AN). In hindsight, going to -12AN wasn't really necessary (desirable, but not necessary for my application). Go to -12AN if you track the car. Rob's design does result in a cleaner installation with all the AN lines
below the front cross-member, but the trade-off is that you do have to manually adjust the flow vs having the thermostat do that for you. In colder weather climates, this actually may be a better option. Rob makes cool stuff and his quality is unmatched.
-Dean