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Is that an exhaust pipe on the left hand engine, right on the edge of the picture?
It starts inwards before curving down vertically.
I agree.I would suggest that is a coolant line.
Yes. This is one application that paired the separate banks into a single manifold. It was also designed from the outset as flame-dampening unit. It is a large, and conspicuous assembly.I found this image on Heinkel He 177 - Wikipedia and tried to brighten it a bit.
View attachment 519823
The outer banks have exhausts that go down to the sides.
I think the inner exhausts go in behind the bottom fairing.