Will this bolt directly to my engine without modification?

Yes — it uses factory B20 mounting points. No drilling or welding needed.

Do I need to purchase gaskets and hardware separately?

Gaskets and fasteners are not included. You'll need header gasket material and stainless bolts to complete the installation.

Can I paint this or does it need prep?

Stainless steel doesn't require paint, but if you want a finish, light surface prep and high-temp paint designed for metal work. Most builders leave it bare stainless to show the material.