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Spoilers help reduce turbulence behind the car, improving gas mileage and reducing drag (many drag cars use it for this purpose). You won't get much of any downforce from a spoiler. As a cosmetic mod, this beats all other options I've seen, although a properly sized and proportioned wing is still something I would like to see. Our body styles don't lend well for an OEM-like wing it seems.
Also, it seems our cars are pretty well balanced, not just weight dist., but downforce forward/aft. If you add a wing, you'll most definitely need to also add a front splitter. With the rear spoiler, you can get away with no front end modifications.
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