My New 98 gsx build

[Halon]

600hp on what dyno? Kerry made over 600hp dyno-jet on an FP manifold and a regular old SCM61, think it was internally gated too.

Something else about tubulars. They look cool and all, but it also comes with some unwanted complexity. Rather than 4 bolts on top of the manifold, easy to get to, to attach/remove the turbo, you now get to deal with 4 bolts underneath, that are a pain to get to. They might come loose so you have to go under there with an allen or whatever to tighten. installing the nuts to attach the mani to the head, depending on the manifold that can be a PITA. You will likely have no heat shield.

At least in my experience, the more I mod and put in aftermarket stuff, the more I appreciate OEM quality and designs. And the more I appreciate keeping things simple. Not always the case obviously, but often the case in my experience so far.

Just my point of view I guess, everyone will have their own. Good luck to you whatever path you choose.