The orifice in the Baldwin filter is in the center hole, where the threads are, so the return in my case.
I read on the FAQ about the concern of the TP being pushed into the engine and that's what they say, so on their kits, the orifice must be on the return side.
The way bypass filters are made, you could and would most likely do engine damage as they are designed to filter slowly and have no internal bypass, so if it gets plugged, the oil will slow down, maybe stopped enough to do damage or maybe the filter could explode?