From what I have observed a wing/spoiler will increase downforce on any vehicle no matter if it's FWD or RWD. A wing WILL add stability when driving at highway speeds and they greatly increase the downforce for cornering. The faster you drive the more beneficial a wing/spoiler will be to you. The placement and height of the wing/spoiler in regards to the shape of your vehicle will also effect its ability to create downforce. Most aerodynamic customizing will help at speeds of about 50-70mph. So no matter if you autocross, drag race or drive like an idiot (my fav) as long as you reach 50-70mph your downforce mods will help. Nobody wants their car to get squirrely when their doing 120mph, so a wing helps that. IT ALL BOILS DOWN TO THE HEIGHT OF tHE WING AND THE SHAPE OF YOUR VEHICLE.
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