Do I need any tools to tighten this clamp?

You'll need a wrench or socket to tighten the band. Most band clamps use a standard bolt head — check your socket set before install.

Will this clamp work on both new and existing exhaust systems?

Yes. This fits any 2.5" diameter butt joint, whether you're joining new pipe runs or repairing existing sections. Just make sure the tubing ends are clean and aligned before clamping.

Can I reuse this clamp if I disconnect it later?

Stainless steel is durable and won't degrade from heat cycles, so you can loosen and retighten it multiple times. The seal depends on how tight you cinch the band — keep it snug but don't over-torque and crack the band.