Do I need to remove the catalytic converter to install this?

No. This catback system bolts directly to your existing factory catalytic converter. You're only replacing everything downstream from that point.

Does this come with new gaskets and clamps?

Installation hardware is not specified — test-fit the system before final assembly to confirm what fasteners you'll need. Most builders grab stainless clamps and high-temp gasket material from their local supplier.

Will the tip need any prep or polish when it arrives?

The rolled tip ships polished. You can run it as-is or hit it with metal polish if you want extra shine. No sanding or primer needed.