To put the conclusion first: even among products labelled as "CAN invader countermeasures," real-world strength varies. Since catalogue check marks do not tell the whole story, here is how we suggest choosing.
What is often overlooked is whether the mechanism depends on the vehicle's own communication state. Options that lock and unlock in conjunction with the keyless system depend on that communication, so if the communication is disturbed they may not behave as intended. We have observed such cases in our own installation and verification work.
That is why the key question is whether the system can keep "directly monitoring" regardless of the vehicle's communication state. Within what we have actually verified, the IGLA series met this condition.
Among those, AUTHOR ALARM has a dedicated operating mode specifically for CAN invader scenarios, and we consider it the strongest countermeasure among the products we handle. Its ability to detect an abnormality and sound the alarm immediately is also a major obstacle for thieves who want to finish quietly and quickly.
This is an area you cannot judge without hands-on installation and verification. If you thought you were protected but have started to feel uneasy, please feel free to consult us. We will check your vehicle and suggest a sensible combination.