For the 04-06 models, you need to have the trim tool to unlock the bumper from the 2 sides - it's attached on item #4 in the diagram posted above. If you brake the clips, you need a new part. If you break the bumper tabs, you might need a new bumper - it will stick out badly. Be careful.

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Stable: e92is, e46 M54B25, e83 N52, e53 N62 - sold, e39 M54B30 R.I.P.