the people that have them are using them!
haven't seen one on here for a good few months even years
you will have more luck contacting HKS "Europe" for a cube manifold
or go custom
Identical, cant see Nissan using a different manifold, to keep costs down they used a lot of indentical parts n the CG10 and CG13, the only difference was the engine internals, (and gearbox and driveshafts on the earlier K11s)
Only place I know of who sells a turbo manifold for the CG10/CG13 for a sensible price. It may not be the best design but you are budget limited and with the HKS proving difficult to source from HKS Europe, as they are reluctant to sell anything separate, and the price coming in at £300+ it's worth an enquiry....