Noisless soil pipe system?

I have seen what is claimed to be a "noisless" soil pipe system at a trade show.
It is made by Wavin plastics, but I couldn't find any mention of it on their web site.
My question is this: How can a single-wall pipe be noiseless? the water flows in it just like others, I suppose...
I am thinking to replace the pipes (from upstairs toilet) in my downstairs toilet with the noisless ones, but am wondering if this is just a sellers claim.
They say that they are good for hotels etc.
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Its a gimmick.
By the time you have boxed in the stack you can't hear a thing from the stack.
You could insulate the boxing with rockwool if you want to be doubly sure.
dg

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Hi,
My stack is boxed in and insulated with rockwool but you still hear it occasionally - but not enough to annoy me. Although if it were in a bedroom it would...
I believe cast iron pipes have good sound insulating properties.
alan.

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