yes you can. just make sure to bed them in properly and lay a new layer of material on the current rotors. although best practice per the dealer would recommend rotors at the same time. ultimately its up to you but i do this when i switch to track pads. its fine.
2011 E82 BMW 1M Series Coupe #642 of 740 (current)
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2004 E46 BMW M3 LSB