I dont think they designed them to begin with. I will have to dig through old photos but I am about 95% sure they are copies of the old HKS manifolds only with that strange proprietary 4 bolt wastegate flange added. If that is the case, it would possibly explain why they wouldnt fit very well without the same little turbos HKS was using in their now long discontinued "turbo starter kit" they were selling for 350z/G35. It was a bare turbo/manifold kit and the buyer had to fab up IC and piping. Really an awesome idea because so many people would love to build their own kit, but manifolds on this engine layout is just too hard for most fabricators and DIYers. But it didnt take off.
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