Thank you for your reply.
1 - The ultimate backup are duplicates.
2 - I just removed RichsPoliceEnhancements. After that, cops join the pursuit but can't get the suspect. They just get closer to the suspect when pursuits ends.
Thanks.
When in pursuits, other police cars spawns but don't join pursuits. They spawn and remains in the same place.
They just arrives when the pursuit ends as normal backup units.