probably leaking from the valley pan gasket. i would that and the transfer pipe as well. check out URO brand, seems legit and half price of the AGA kit:

BMW Engine Coolant Pipe - URO Parts 11141439975

theres also another coolant pipe you remove to take out the valley pan, it has an o-ring:

BMW Water Pipe O-Ring - Elring 11517507717

dont forget intake manifold seals

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2000 E53 4.4
2011 E70 35d