Citroen Berlingo Van Noise Engine/Airbox

Dear All
I am writing to ask for help to solve a noise problem I have with my Citroen Berlingo 1.9 LX Van. The van is 4 years old I purchased the van
3 months go low mileage. It runs well etc. However I have this annoying noise from or near the passenger side of the dashboard, it with sounds like a faulty blown exhaust. (Throaty side)
It sounds really awful at 20 to 32 mph when driving around town at low speeds. It appears to be coming from the passenger side of the vehicle. I believe it could be near the Air box. I have checked the clamp and this is secure. I have cable tied the hoses to the frame. I have checked the pipes and sealed any loose ones. I spoke to my local Citroen garage and they called it the Berlingo syndrome and did not offer a solution.
The noise is near the dashboard on passenger side. The dashboard is tight and not loose. The noise seems to disappear at speeds above 30 mph or when the revs very low etc.
The air box seems secure but I have not looked inside it is only held on with two screws. Any solutions or recommendations would be welcomed and passed on to my Citroen garage.
Thank you in advance for any solutions.
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Kevs wrote:

Hi the later airboxes have clamps but all we do is drill in the middle of the clamps and put a self tapper with washer on it saves paying for a new box hth.
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Airbox
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