Do these clamps require any hardware beyond what's in the box?

The kit includes the clamps and flanges. You'll need to verify bolt torque specs in your vehicle's service manual once installed, but assembly hardware comes complete.

Can I reuse these clamps if I disconnect and reconnect the exhaust?

Yes. V-band clamps are designed for repeated connect/disconnect cycles. Just inspect the sealing surfaces for debris or wear before each reconnection.

Do the flanges require any prep before installation?

Check flange faces for nicks or debris that could prevent a seal. Clean mating surfaces with a cloth before assembly to ensure the V-band seats properly.