Hey, im looking for a mod in which i can call for more cars to join the pursuit or call a helicopter or set up a road block or a lay a stinger on the road.

You can use the mod called "Custom Backup" to tweak backup much more then the default LSPDFR method allows. It is a great mod but the helicopter sometimes fires a random gunshot every now and then. Also motor cops aim their weapon at suspects while driving which breaks the immersion for me.

 

The mod called "Heli Orbit" changes the way helicopters handle pursuits. The helicopter does a circular orbit instead of hovering 3 feet off the ground.

 

For spike strips there are several mods that do this. There is a roadblock mod that is probably the best one imo but it is currently being revamped/upgraded. The one you should use atm is called "Spike Strips Backup" 

I am a bit confused what you mean by 

13 hours ago, AleDaBoss said:

looking for a mod in which i can call for more cars to join the pursuit

Do you want more vehicle slots? Like you want more models in game instead of police, police2, police3, etc. Once I understand that I can answer it for you.