Do I need new hangers or clamps to install this?

The system mounts at factory points, so your existing hangers and clamps work. Have a jack and jack stands ready, and work methodically — plenty of space under the CRX to get the job done without special tools.

Will this tip stay shiny, or do I need to polish it?

Stainless steel stays polished naturally as you drive — light surface oxidation may appear over months, but a quick microfiber wipe keeps it clean. No ongoing maintenance needed unless you want show-level shine.

Can I reuse the O2 sensor from my stock exhaust?

Yes — the catback bolts after the converter, so your O2 sensor stays in place. No electrical work required, and your check engine light won't light up from an unplugged sensor.