Good question. Sorry, I can't tell you. I only did it in the **hope** that it would reduce drag. Even there, I have to admit that I didn't test it. Still, if someone has the desire to do a proper analysis of the situation with the Volvo 240 A-pillar, that would be interesting, and the I would have a fairing already made to fit :-) I should really have attached flow-threads, driven and photographed. Perhaps I'll do that now... they worked well in my sailing days :-)
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