Downpipe fabrication.
I used a manifold from Treadstone performance. It's a cast manifold, but it's thick, the metal is somewhat soft, but I don't trust the "tube" manifolds that I see being built.
As far as I'm concerned the best manifold in the business is made by Steed Speed, but it's not inexpensive at $750. Treadstone is around $350.
It's setup for an external wastegate, which I had from my 22RTE.. However, plumbing it into the exhaust isn't trivial...
My turbo has a V-band exit, it allows the exhaust to rotate, which is helpful for prototyping.
Here's the mockup:
