It looks like the Tunami V2 is a good bit different than the BM V2.
As far as the bulk cable goes, they both have the same type of wire (10 and 12 GA respectively), copper foil, drain wire, and outer jacket. That is about it.
The BM has spacer/damping rods and a paper tape layer.
The Tunami does not have the above. It has an absorbing layer, and a carbon layer.
I have a finished Tunami GPX-R V2 on order.