I just ordered a new lower housing. The OEM unit is like $90+ depending on where you buy, just for the dumb little piece that the radiator hose attaches to. Turns out Dorman and a bunch of other 3rd party MFG's make them and they are only like $28.The turbo cooling lines need to be moved to the beginning of the circuit. Better radiator helps, but the water pump is too anemic to make good use out of it. The flow through the system should be increased to utilize the aftermarket radiators better. Probe your stocker already! I need some data.
Anyways, I think I will drill/tap the Dorman unit and leave the OE one pristine.