What hardware do I need to bolt this on?

Manifold assembly ships without fasteners. You'll need stainless header bolts, washers, and gaskets to mount it to the cylinder head and secure your turbochargers to the T3 flanges—source these separately based on your specific turbo units and head configuration.

Do I need to prep or paint this before installation?

The stainless steel doesn't require painting and won't rust bare. If you prefer a coated finish for aesthetics, mild prep and high-temp ceramic coating will stick; raw stainless can be installed as-is.

Will this fit my small-block with existing engine bay components?

Top-mount design clears most intake and accessory configurations, but turbo placement and intercooler piping routing depend on your specific frame and bay layout—verify clearance with a test-fit before committing to final plumbing.