Do I need any additional hardware to install this clamp?

The clamp itself is complete. You'll need to ensure your piping has compatible V-band flanges. If your setup uses slip-fit tubing, you'll need to add V-band flange adapters separately.

Can I reuse this clamp if I disconnect it?

Yes. The V-band design is meant to be released and reconnected multiple times. The sealing surface will perform consistently if kept clean and free from debris.

Will this work on my custom exhaust or turbo manifold?

As long as your piping or flanges have a 3-inch bore diameter and V-band profile compatibility, this clamp will work. Measure your current setup before ordering to confirm sizing.