There are quite a few variations exhibited by the posters here. I used a B&B, other have used Setrab, Mocal and Ruf. It's been my experience that a single B&B sealed at the edges so all of the air goes through the cooler w/o any tub modification is fine even on 100°F track days even w/ a 3.8RS engine. As has been mentioned the tstat never stays fully open so engine oil temps stay ~85°C at all times.
The caveat is that in really heavy stop and go traffic on a 100°F day a fender mount w/ fan would be a real asset.
A short while ago there was a Ruf chin spoiler/oilcooler for sale over on Rennlist, it is a
really slick setup.
It's my feeling that there is very little that can effectively be done to protect these things in a front mount position except to drive carefully.
Mine from the front
Mine from below
Ruf
