Will this bolt directly to my stock catalytic converter?

This catback design connects at the factory catalytic converter outlet. Use a jack and lift the car safely, then unbolt the factory exhaust and bolt this system in place. Mounting points and existing hangers from your OEM setup will work with this system.

Do I need a gasket or clamp kit for install?

Check your existing clamps and gaskets during removal—if they're in good condition, reuse them. New gaskets and clamps are not included, so source replacements before you start if the originals are damaged or worn.

Can I polish or ceramic-coat the tip to keep it looking new?

The stainless tip comes polished and won't rust naturally, but you can maintain it with stainless steel cleaner or a ceramic protectant if you want extra shine. Heat and driving will eventually patina the tip slightly—that's normal for a catback system under load.