Quote:
Originally Posted by stevesnj
The OEM rear wing is just mostly for aesthetics, the functionality of a spoiler is for down force but not effective until after a certain speed. For improved fuel economy the OEM wing and under body panels is the way to go.
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Spoilers don't add downforce.
And OP no one can will be able to answer your question. The OEM BRZ spoiler reduces drag and this is known because it was wind tunnel tested. There has been no testing on the FRS spoiler.