I think that it will be hard to get people to sign up for any A20 turbo manifold group buy, unless they can see one installed or at least some sort of prototype.
There are just so many variables relating to how it fits. AC support (Yes or No), Radiator support (Stock or B series), etc.
I could see paying $600 for a manifold assuming it was made professionally, was guaranteed to fit (and had pictures of one installed), was somewhat mass produced (so they would be consistently made the same, which it definitely looks like these would be), and was available to buy at any time (without a group buy).
Right now no one is offering this kind of product. Yes, there is that ram horn that Evolution Inc. sells (mentioned earlier in the thread), and you can apparently send a gasket or flange to f22parts.com and get one made ( https://www.3geez.com/forum/showthread.php?t=53391 ), but it all seems to be a lot of work, and it is pretty vague about what is available.
If someone did make a mass produced manifold, they could corner the market, although I am not sure how big that market is... It is all a matter of getting that first one designed, built, and tested...
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