This plan was a fail from the very beginning. I’m posting it here still so you know the origins of episode “9.1.”
Fail 1: Turbo location. The turbo would have been up high and off to the side, and the downpipe would have used all of its heat power to melt the brake master cylinder.
Fail 2: Adding multiple points of failure. You’ll probably see after you get your Miata boosted, that manifold studs and bolts take a ridiculous amount of abuse and fail regularly. Even the highest quality parts have their limits, and adding a completely unnecessary point of attachment between the manifold and turbo was a terrible idea. See the episode 9.1 for the fix.