here is a kind of poor picture

anyway, it does 95% of what a $70 piece does, but only cost me $7 (.024" Al sheet, 24"x7" or so). I cut it out with a Hyd shear, band saw, and some hand tools/files then bent it with a manual break we have, and finally painted with some ceramic engine paint I had around.
Looks nice in person - my wife didn't see it until I pointed it out (she likes the cheap mods! haha)
Who knows if I even push the cooling system enough to need such a thing, but hey it's cheap and fun to make stuff. Along with the Crucial T-stat and water wetter - this thing should never get hot!
-Chad