Do I need any tools or hardware to install this clamp?

You'll need a wrench or socket to tighten the bolt — the clamp itself ships as a complete assembly. No additional hardware required to secure the joint.

Will this clamp work with existing exhaust pipe, or do I need to prep the ends?

The pipe ends should be clean and free of heavy rust or debris before clamping. A wire brush on the joint area ensures solid metal-to-metal contact and a tight seal.

Can this clamp be reused if I need to disconnect and reconnect the exhaust later?

Yes. Loosen the bolt, separate the pipes, and re-clamp when ready. The stainless steel won't degrade with repeated use, though the gasket or seal surface may wear — inspect before reinstalling.