Vauxhall Insignia unusual noise

Some Vauxhalls are fitted with a thing called a secondary air pump and these can make some very odd noises.

I had the same problem with my insignia I took it to vauxhall dealer and they told me they are aware of this fault but it is not on recall.there is a thin pipe coming from turbo to front panel that goes in a small white module and vauxhall dealer put an extra little black module on it an this cured the problem an I've not heard it for a year hope this helps