I went with a Tomei down pipe, the construction is a lot like the Tomioka, probably the same diameter tubing. It's a donut style gasket flange, not flat flange, I wanted to keep it factory like. It was $400 delivered from a vendor on fleabay.
Search vf36 on fleabay, There is a Kinugawa bellmouth for $349 shipped, I thinks it's Jdm length and donut style. There is also a kakumei, twin dump, flat flange for $300 + 80 shipping.