All I'm going to say is anyone that takes a good look at that setup and thinks about it should realize the concept of cooling water through a radiator is airflow. When you block airflow over roughly almost half of the radiator undoubtedly you will lose cooling capacity.
Although the fans don't move as much as other options, I bet if you cut big ol holes in the metal areas of that shroud so air could pass through it would probably keep it a lot cooler. I'm sure that wasn't cheap, but sure looks to me like it was designed for looks versus proper cooling.
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