cost of a carbon clean??

[tempestv8]

Does anyone know what would it cost to have the intake manifold cleaned out by the Nissan dealer or a competent workshop? I am researching for a used GU5 or later (CRD motor) and am wondering if high mileage examples will require an intake manifold clean. I don't have the skills or tools or facilities to be able to do this, so I need to factor in the cost of getting this done properly by professionals.

Thanks in advance!