Hey Oliver....

[Burple_X]

Who's front spoiler do you have on your car?  I'm looking at the ReVerie http://www.sector111.com/products/carbon_fiber/exterior/reverie_spoiler_with_splitter.cfm from Sector but I also like the less expensive version too http://www.sector111.com/products/performance/aerodynamic_upgrades/gut_sport_spoiler-splitter.cfm  I really liked the look of the one on your car.  Any ground clearance issues with it?

[alilbrit]

 
I have the ReVerie Elise Spoiler w/ Splitter.  It costs a bit more than the Gut version, but it looks to add more downforce IMHO.

It is definately lower than stock and I have touched the ground with it a few times.  But...... the CF is very good quality and pretty resistant.  Plus does protect the underside of the clam.

It probably depends on what look you are going for and what purpose.  For me, I wanted track performance, so I did the splitter in conjunction with the rear diffuser. 

Maybe a rear diffuser would spoil the styling of your sweet Cali option?  The Gut might look more subtle?

[Burple_X]

Whichever I do, I am going to have it painted body color.  Since I already have the rear spoiler, I might not have to do the diffuser, but I wouldn't even mind doing that.  Thinking about a different wheel too.  The stock wheels are a PITA to clean and I think black would look much better. 

[alilbrit]

Ahhhhh a body colored front splitter would look great on yours.   

If you went for a bodied colored CF rear diffuser too, I think you would be breaking new ground - never seen that done before.

Loads of wheel options out there - yours do look horrible to clean!!
I recently got a Team Dynamics set in black - very happy