that's a tuff call,
But gut feeling is to leave it on.
The windage plate doesn't stop all air flow around around the fins and also acts as a heat sink.
I have to ask my self why would AC waste their time putting it on in the first place?
It costs them money to put them on and why would they want to risk the extra heat on the clutchs and belt for the slight bit of wind advantage that nobody will ever feel.
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