I ummed and aahhed a long time on whether to do the same with my aerokit and am now wishing I broke it up with some silver/titanium after seeing how well yours turned out! Looks good
In hindsight I should have done it. The silver breaks it up very nicely as on black/darker cars the aerokit does not show up as much and is not as striking as say on an Apline White.
THe porsche looks good with the silver mirrors, on the X... not sure would pull it off though.