When airflow gets to the fitting, it will either have the additional obstacle (restriction) to overcome.
That pic looks nice, a sharp V on the fins, if the backside tapers back to a V the same way, good job. I would just "round" the transition, instead of the flatspot or angle change. If you like, you can widen the fins, in the effort to make them as thin as practical, the idea being invisible to the airstream.
With respect to the ID of the fitting, if you can enlargen it just a bit, in a blended curvature, so that no x-sectional area is lost (from the addition of this beautiful cut piece) that will help minimize head loss as a suction side restriction (the worst kind).
The last thing you want is a failure due to cavitation. that is what I fear. And larger diameter, at the fin location, may help.
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Michael Patton (aka Killerbee)
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