Do I need new gaskets or seals where this connects to the cat?

The connection point at the catalytic converter may need a new gasket depending on your current exhaust condition. Grab a replacement gasket kit before install—they're cheap insurance against exhaust leaks at that joint.

What tools do I need to bolt this on?

Basic hand tools and a jack with jack stands. You'll be working underneath, so safety first. No special equipment or exhaust shop gear required for a straightforward bolt-on job.

Does this system come with new clamps and hardware?

Hardware and clamps are not confirmed in the system specs. Measure and verify your current clamp condition before install. If they're worn or corroded, source replacements ahead of time so you're not caught halfway through the job.