Do I need custom exhaust tubing to connect this downpipe to my cat-back system?

Downpipe outlet diameter isn't specified — measure your existing cat-back inlet before ordering to confirm fit. You may need a reducer or adapter depending on your exhaust setup.

Will this manifold bolt to my current turbo, or do I need a different charger?

Turbo flange type and bolt pattern aren't listed in the specs. Verify your turbo's mounting flange matches this manifold before committing to the purchase.

Does this come with gaskets and studs, or do I need to source those separately?

Only the manifold and downpipe are included — you'll need to source gaskets and studs separately. Pick up quality stainless fasteners to match the material and avoid galvanic corrosion at the cylinder head.