Will this bolt directly to my factory catalytic converter?

Yes. This system connects at the cat as a direct bolt-on. You'll need basic hand tools and jack stands to support the vehicle from underneath while you work.

Does the stainless steel tip need any finishing or polishing out of the box?

The rolled tip comes ready to install. Over time, you can polish it to maintain shine, but it's not required for function or corrosion protection.

What's included with the exhaust — do I need to source clamps or brackets?

Mounting method not confirmed in the specs. Before you commit to installation, verify what hardware is in the box and test-fit the system to your vehicle to confirm what fasteners you may need to source separately.