Do I need any special tools to tighten the clamp?

A wrench or socket that fits the clamp bolt is all you need. Hand-tight plus a quarter turn usually seals it—you're not fighting corrosion like you would with traditional bolt connections.

Can I reuse this clamp after I take it apart?

Yes. The V-band design is built for repeated assembly and disassembly. Just clean the flange surfaces before reassembly to keep the seal consistent.

Will this handle high-temperature exhaust without leaking?

Stainless steel handles the heat. The clamp itself doesn't degrade at normal exhaust temperatures. Tightness depends on how well you match the flanges and seat them flush—any gap or warping will cause a leak.