Will this bolt directly to my stock catalytic converter?

Yes, this is a catback system designed to connect at the catalytic converter flange. You're keeping the OEM front pipe and cat, so fitment is straightforward at the connection point.

Do I need to weld anything or is this purely bolt-on?

Purely bolt-on. All connections are flanged joints that use fasteners. No cutting, welding, or fabrication required.

What about clearance at the rear bumper with the rolled tip?

The rolled tip design sits flush with most OEM and mild aftermarket bumpers. Test-fit the tip location before finalizing your install to confirm clearance with your specific bumper setup.