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Maybe so, but I owned a Subaru for years and was fairly active within the community, and I never recall hearing it referred to as a roof vane spoiler. It's purpose is to reconnect boundary-layer air and create vortices that flow more, cleaner air over the rear airfoil (i.e., the exact same purpose as Mitsubishi's tabs). If it walks like a duck and talks like a duck...
And especially in the context of the OP's question, I think he should be made aware that it is not going to serve the purpose that he is wanting it to.
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