Will I need new gaskets or fasteners to install this?

You'll likely reuse your factory gasket and bolts where the catback connects to the cat. Have a gasket set on hand in case the original is damaged during removal—it's cheap insurance.

Does this bolt straight to the factory catalytic converter?

Yes, this system is designed to connect at the cat flange. No modifications or adapters needed if your cat is stock.

Can I paint the tip, or does it come pre-finished?

Stainless steel won't take paint well and doesn't need it—polishing keeps it looking sharp. If you want color, ceramic coating designed for exhaust tips will stick better than standard paint.