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

No. This is a catback system, meaning it bolts on after the cat. You're connecting to the factory mounting points where your old exhaust connected.

Will this require any welding or cutting?

Bolt-on design means no welding, no cutting, no permanent modifications. Unbolts your stock system, bolts this one in its place.

Does this come with gaskets and hangers?

System assembly is included. Verify all clamps and hangers are present before installation—some may require reuse of OEM hardware at connection points.