While Flyin Miata and BEGi are great, there are other places that sell various components that make up a turbo system, so you can piece together your own kit.
JGS has both pre-made exhaust manifolds and DIY manifold kits for the miata that have been proven to be reliable. They also have an oil line kit, and some other small stuff.
M-Tuned offers a bunch of stuff, includeing a fuel rail, engine internals, and exhaust manifolds for our miata.
Boundary Engineering has a couple good products like the bullet oil pump gears, and has more stuff planned!