N47/57 series engines have a completely different manifold design. The swirl flap mechanisms are totally different, and of an in-line design.
As is shown on the BMWLand threads, the older designs have been a cause of great concern and debate, as total engine failures have been caused by a simple ingestion of a flap part.
Revisions have been made even on the M47/57 engines, but early cars with small flap spindles had major issues. We can see why BMW have moved to a new design, with ther latest engines.
HighlandPete
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