Do I need a professional to install this, or can I do it myself?

This bolts to your existing catalytic converter — most owners handle it with basic hand tools and jack stands in a couple hours. You'll want a torque wrench and a lift if you have one, but it's DIY-friendly. If you're not comfortable under a car, a local shop can knock it out for you.

Will the stainless steel tip stay shiny, or does it tarnish?

Stainless will develop some discoloration from heat and exhaust residue over time — that's normal. A quick polish with metal cleaner brings it back. It won't rust through like mild steel, so you're protecting the investment long-term.

Does this come with all the clamps and hangers I need?

The system assembly is confirmed, but mounting hardware specifics aren't detailed — test-fit the system to your car before assuming what fasteners or clamps you'll need. Grab any missing pieces from your local parts store or have your installer source them.