do anything? Or is it mostly for styling?

For the majority of mainstream cars, spoilers end up being mostly for show. However, if you're a bit of a lead foot, they can actually do some good. Depending on the type of spoiler, its size and the placement of it on the car, it could help a bit with handling and, although very minutely, could also improve gas mileage in the long run. Spoilers create downforce by directing the airstream the flows over your car at speed. The higher your speed, the more downforce is created. Typically, spoilers don't really do much benefit at speeds lower than 55-60 mph (Always observe posted speed limits!).I don't claim to be an expert but I have been an avid car fan for 20 years. Hope that helps.