I added a boundary layer splitter plate.
That is the yellow part just above the rad.
The slot goes all the way straight back to bypass the boundary layer.

One of the big advantages of this system is it is very
easy to change. If you need more cooling you can increase
the rad angle. If that does not work it is a simple matter 
to install a larger rad. No need to make a completely
new compound curved duct.

Paul Lamar
 
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