Making the billet plenums isnt really "expensive" for me since I can machine them in-house. But the machine that makes them is expensive and can be pumping out parts that would be worth more per hour of machine time. But thats OK, my machine isnt running 24/7 so until it is, I dont have to choose only the most profitable items to run through it.
Making a pattern/die/whatever-you-want-to-call-it for the CF wouldnt be a big deal, and if all other things work out, I have no reason to not at least get a quote on the CF plenums.
Thing is, for the GT-R its a lot easier to build a successful manifold, its a turbo engine. Everyone is going to gain big power for it, with minimal cost to low end that nobody really even cares about in a 1000+ hp car.
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