Love my carbon parts but agreed it wouldn't have the same visual effect on a black car...
Stick to simple mods to start:
Blue dash lights if it doesnt already have these
If you want maybe change to the duck wing spoiler
You can get a series 2 front lip extension which looks good, not sure where to source them
Tint definately
Get some comfy seats in to, makes alot of difference driving not sliding around in your chair.