1. It isn't a spoiler. It's a wing. A spoiler is when it's attached to the car. A wing sticks up into the airflow.
2. Most factory rear wings do not generate any downforce... in fact, the only one I can think of off the top of my head is a 1969 Charger Daytona, or a 1970 Plymouth Superbird, but even those were 'set' to ZERO at the factory....
3. It probably adds stability.... maybe....
- Rob
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