Okay, on the subject of downforce. Rear downforce on a FWD car is important. Especially if you are racing. Rear wings can help with understeer and oversteer if properly adjusted. Most of these big goofy wings are more cosmetic then functional. Its also important to balance the added rear downforce with frontal downforce.
You are correct about drag. Addition of downforce also means more drag.
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Racing Rice
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