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Fans don't really get in the way of a carb cleaner leak hunt. I suggest that you're overthinking this.
Also, once you pull the manifold, you need to replace *everything*. Even if it's not leaking now, there's a good chance you'll make new leaks in the fragile hoses/gaskets that are there. Precision isn't really important. All you need to do is confirm that there is a vacuum leak somewhere in there.
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2011 M3
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1989 M3 S54B32
Hers:
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