Tip #1
First of all, if you have a new car, you need to find out from your dealer if the rear spoiler is possible to get for your make. Keep in mind that if your car is still under manufacturers warranty you can lose it by making modifications yourself. And if you do get it at your official dealer it will not affect the warranty and also apply to the specifications kept in mind for your vehicle.

Tip #2
There are a lot of choices on the market when it comes to spoilers. The generic steel ones can be carbon-made, aluminium and double-aluminium. The blades on the latter ones can be adjusted based on your car specifications. Also there are plenty of spoilers for SUVs and pickup trucks as well. Generic plastic rear spoilers usually differ in sizes. You just have to keep in mind what is the main reason behind getting a spoiler for your car. For example, if you want to protect your rear window from dirt build-up on your SUV, then you should avoid generic ones and get the specific model for your car at the dealership to avoid such issues as fastening, painting and so on.

Tip #3
Avoid buying used rear spoilers, or from a shady online stores that don’t offer any warranties or guarantees. If you’re getting a plastic spoiler, pay attention for hidden defects and air bubbles under paint. Also look at the bending spots of the pastic, it should always be the same thikness. If you see any defects, it’ll mean that this rear spoiler is of a low quality.