Jet engine

Hey guys



I am a new rover 75 owner and loving it so far.

I have a question. When my car is running there is something next to battery box and fuel system that sounds like a jet engine running. Even when i switch it off it still runs for a couple of minute. There also a breather pipe which i think is part of it. What is it? and should it sound like that



Thx



Richy

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