What do you mean by "run the full shroud". did you have part of it covered up or do you mean ducted in.
Difficult to explain it without showing you the CAD model.
FM originally recommend that we cut a hole under the oil cooler in the undertray to take in some of the air there, it was never too effective for me.
Essentially I designed a full shroud to go over the front of the oil cooler, then an opening, a sort of 'scoop' that would take in the air from under the car from the OEM NB front skirt's little rise in the middle of the bottom part that would be diverted to the oil cooler assembly. I also had two tubes on the shroud itself that would be connected to the hoses already connected to the fog light holes in the bumper. Effectively sealing the air coming in to ensure they all flow through the cooler.
Well, never finished the design before my motor blew up, it was only partially completed. :cry2: