fwiw, if a car (beemer) has factory hids available out there, even if a little more, i'd go for those. on a car where there are no factory options, aftermarket would be next best thing.
and to specifically address your question, silver stars are not bad. certainly nicer than stock bulbs.
to make sure there aren't even better bulb options out there, i'd check out daniel stern's website to see what he offers for your type of lights. (sometimes he even has a full-on replacement unit w/ better lense/mirror/specs etc. )
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