First, are those HID bulbs in projectors? If not, get rid of them and replace them with standard halogen bulbs, or swap out the reflectors for a proper projector retrofit.
Second, if you do in fact have projector headlights, swap out those 10000k bulbs that look r1cetastic for some OEM spec 4300k bulbs. Your car will look at least 13.5x more classy with OEM spec bulbs.
Next, ZHP shift knob. Looks better, feels better, is better.
CF wrap trim mebby?
Leatherique your seats to black. Or, if you want sport seats (probably), go look in the classifieds, on craigslist, and on ebay for some black sport seats. If you are spendy, you can usually find a nice set of heated, black M3 seats for <$1k.