this is actually pretty straight forward... i replaced my front bumper recently with a vorsteiner and noticed that it would be easy to just replace the bucket pan as well. note, you will need to remove the front bumper. which is pretty easy.
2011 E82 BMW 1M Series Coupe #642 of 740 (current)
2011 E92 BMW M3 AW
2004 E46 BMW M3 TIAG
2004 E46 BMW M3 LSB