Do I need gaskets or hardware to install this manifold?

Gaskets between the manifold and cylinder head are separate items — you'll need OEM or quality aftermarket gaskets. Bolts and mounting hardware are not included; source fasteners to match your head bolt spec and torque to factory service manual specs.

Can I use this with any T3 turbo?

Yes. The T3 flange accepts any standard T3 turbocharger. Make sure your turbo inlet and exhaust outlet sizing match your intake and downpipe plans.

Does this manifold need to be painted or coated before installation?

Stainless steel won't rust bare, but high-heat coating will protect against discoloration and extend appearance if that matters to you. Test-fit before committing to any coating — paint or ceramic can be applied post-install if desired.