Does this system require the factory catalytic converter to stay on the car?

Yes. This is a catback system, so it connects after the converter. Your existing converter and upstream exhaust stay in place — you're only replacing everything from the converter back.

Will the burnt tip discolor or need refinishing?

Burnt tips are produced to that finish and designed to hold that appearance. No special maintenance required — natural light oxidation and heat cycling will not degrade the look over time.

What do I need to bolt this on?

Standard hand tools and jack support. Test-fit first before final tightening to confirm clearance with your existing undercarriage. No drilling or major modifications needed — mounting bolts to factory connection points on the converter.