Will this bolt directly to my stock turbo and downpipe?

Yes—manifold mounting and turbo flange are OEM spec. You'll want to confirm your turbo's flange condition and downpipe fit before final assembly, but drilling or custom fabrication isn't needed.

Do I need to prep or coat this before installation?

Stainless steel is ready to bolt on as-is. Heat cycling will cause surface discoloration over time—that's normal and doesn't affect function. No primer or paint required unless you want cosmetic coverage on the outside.

What hardware comes in the box?

The manifold assembly is included. Verify your existing OEM studs and gaskets before install; you may reuse factory hardware if it's in good shape, or source new studs and header gasket separately depending on condition.