Plenty of Prius owners have fallen victim to catalytic converter theft in the past. While you can’t stop every attempt, you can always make stealing your catalytic converter harder for thieves. The Catstrap is an interesting device that slows criminals down considerably. It is very hard to cut due to aircraft-grade steel cables hidden inside it.
The Catstrap is available in bright orange color to let thieves know your car is protected. You can get further protection with the Sonic Shield, which is a smart sensor that can detect activity under your vehicle to sound a 130dB siren.