It will be heavier than what you currently have (if you have stock rims). If may not be enough that you will be able to notice. If you are into Auto-x or running your car at the track it would not be a good idea to use those rims, as they will hurt your performance. But if running your car at its peak performance capabilities is not your desire or goal then they won't be a problem. Many people here run their E46 with those rims and most don't seem to complain. Good luck
I put on 18" M3 wheels on my 330ci in lieu of the M68's. The M3 wheels where 4lbs ea heavier (with tires) than my M68's, and i swear it felt more nible with the M68's.
The Brytons are around 3-5lbs heavier than the M68's (around 26-27lbs ea) so the difference will be slight but you may notice it.
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