Their are blacked out kidney grills specifically for the e92 ( yes 328 are e92 as well). Angel eyes are stock. If you mean change the color of the angle eyes you can search and find a thread about it. All you need is a set of H8 35watt bulbs. Its much easier then the sedans. And theirs no such a thing as blacklines for the e92.
I dont see why you would even need warranty on your kidney grills. And if your new angel eye bulbs burn out, just buy a new set or replace it with the stock ones.
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