Hissing noise under acceleration

[625jamie]

I have a c220 w203 on a 55 plate it's done 90k and I have a annoying problem.. when I accelerate I get a hissing air escaping noise which seems to be coming from the passenger side of the engine.. im getting a lack of power due to the lose of vacuum I have changed the intercooler pipe on that side but still the noise.. please anyone have any other ideas?? I've visual checked the hoses around that area and no visable holes..

 

[625jamie]

It's ok I've found the culprit.. it's the lower part of the intercooler hose has a split in it