Kameari makes high quality, very expensive, parts. They are good parts, you don't see them used because the majority of S30 owners can't exactly afford them, and if they can afford them they can afford an engine swap to something more worth money like that. Personally I don't think the L6 is worth that kind of money, I would much rather do an RB swap, or SR swap, or LSx swap. Something that is going to be a better base platform with more options for aftermarket parts. You get what you pay for though, at least most of the time. zccjdm.com sells thier parts. He is a vendor on here. Take a look he has parts from them listed on the website.
Good luck.