Check out the highly effective Verus Engineering front splitter for the 987 Cayman!!!
Front splitters are very effective at producing front end downforce without increasing drag significantly by creating a large pressure delta between top and bottom surfaces. The splitter is produced from a carbon thermoplastic, which is the same material used in high forms of Motorsports. The material is not brittle, so no more issues with cracking like carbon fiber and ABS. It will not grab and bend under the car like aluminum units either.
The air dam is used to bring the splitter flat with the vehicle's underbody and improve performance further. The air dam is produced with pre-preg carbon fiber and is cured in an autoclave for reduced weight and improved strength.