Do I need gaskets and bolts to install this?

The header itself doesn't include gaskets or fasteners—you'll need header gaskets and stainless steel bolts from your local parts supplier. Use the factory bolt size; your service manual has the torque specs.

Does this need to be painted or coated before install?

The stainless steel is bare and the ceramic coating is applied to the interior runners only. Exterior is ready to bolt on as-is, but you can polish or ceramic coat the outside if you want a finished look.

Will this fit my existing exhaust system?

This header bolts to the factory head flange. Your downstream exhaust (manifold, cat-back) needs to match the header outlet diameter and bolt pattern—test-fit before final assembly to confirm clearance at the engine bay.