You not on a Tomioka any longer? Or just switching to the larger Tomioka housing?In for some logs and a DYI video. I may follow suit.
It is super easy to switch the exhaust housings on these turbos. Barret from IE did an off-the-engine IS38 video. I just installed a new core in an IS38 myself. Was super straight forward.
https://youtu.be/HwTfZXGLhAk