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There are many viable material options for building a splitter. If on a budget, many race teams have great success with plywood. Of course this isn't pretty, but it costs a few magnitudes less than a CF foam core option.
Depending on the application, we have used both ABS and Alumulite for our street and track cars.
If the car is track focused:
Alumulite is very lightweight and is easy to form. It's quite rigid and typically the "racers choice" when it comes to inexpensive splitter materials.
If the car street/track focused:
ABS on the other hand is slightly heavier and has a bit more flex, but is far more durable. While Alumulite may bend and deform on impact; ABS will flex and hold its shape. Additionally, the edge can be rounded with a router to help air flow under the car and prevent the splitter from catching on driveways or dips.
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