[Blacked out 2013]

I am considering a few additional mods to my 2013 335i sedan. It is bsm, with 20% tint all around, M performance rear spoiler, M performance black grilles, M performance rocker panel decals( MPPK on order) , 19" 403 M wheels. It is of course an M sport.

The options I'm considering are the matched front reflectors( already decided on this option), rear bumper reflectors to match( I am unsure on this as I haven't been able to see many pics of the rear bumper matched reflectors) if I change the rear reflectors, should I also go bsm or match the rear diffuser ( dark shadow or whatever it's called)? I am also considering a front M performance splitter. If I add this, should I leave it matte black, or have it painted to match the black sapphire metallic? If I have it painted , how much should I expect to pay for paint and how much for installation?

Thanks for any advice/ help in advance.