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Either one will add downforce to the rear. Diffusor would be more stealth and have the least drag for a daily driver but not adjustable for different downforce levels like a wing and probably not able to give as much total downforce either (wing will have a larger Cd hit though...) - assuming you are talking about a functional racing wing and not non-adjustable one.
Diffusor is on my list to do to my FRS...
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Had a '13 FR-S Asphalt 6spd manual (bought new 5/25/12, sold 6/10/20) but needed to let her go... she will be missed.
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