Does this system keep my catalytic converter and muffler?

Catback systems start after your cat, so your original converter stays in place. The OEM muffler is replaced with this stainless assembly for better flow and sound.

Will this tip rust if I don't seal it?

Stainless steel resists surface rust naturally, but the burnt-blue finish on the tip can develop patina over time. Some drivers polish it occasionally to maintain shine; it won't compromise function either way.

What's required to hang this system?

Catback systems use factory mounting points, so you're working with existing hangers and brackets on your car. Basic hand tools get you through it, but confirm bolt torque specs in your service manual before final tightening.