Carbon Fibre Kamei style airdam from LA Performance in the uk.
Shallower than the Kamei by about 1-2 inches, so more ground clearence if your lowered.
Made a big difference to stability at speeds over 50 mph, less 'jittery' on the road.
Top in the picture (above rear window) is my Remmelle style carbon spoiler (from carbon joe), again made a noticible difference at speeds over around 60mph.
Lower one in the above picture (on engine lid) is a kamei engine lid 'spoiler', no noticible performance difference, but keeps the rain out of the engine bay.
I also have a kamei airdam at home, and pictures of it on the car... Will dig out and post some images.
Is the only one I have of it at the moment, it is deeper than the carbon one I have, is ABS plastic, as opposed to carbon fibre (it can take far more abuse before cracking) and the fit is just as good.
Feel free to use the above pictures/info.
CHeers,
Sam C