My take on the pursuit system in NFS Heat.

IMPORTANT FOR INSTALLATION
NOTE: In order to play this mod, you require the latest version of Frosty Editor. You can download it from this link:
https://archive.org/details/frosty-editor-v-1.0.5.9-alpha-20200116https://archive.org/details/frosty-editor-v-1.0.5.9-alpha-20200116

After you finished downloading, simply open up the editor, select your needforspeedheat.exe file, then open up my fbproject file and last but not least, press launch to play the game with my mod activated.

Features:
- The Ford Police Interceptor Utiilty and the Chevrolet Camaro have now been added to the car roster used by the cops during pursuits.
- Rhinos have their 'rhino incoming' message removed and their map blip is the same as other cops.
- Daytime cops are now on the same level of difficulty as nighttime cops.
- Killswitches are now equiped in Camaros & Corvette Interceptor vehicles so as a result they are a lot more prominent then before. Furthermore, at the highest heat level Interceptors only gotta lock on to you for a second, so the Killswitch Jammer update now 
  actually is a usefull tool to have at your disposal.
- Lower heat levels are easier then before while higher heat levels are harder. Each heat level gradually increases in difficulty as to prevent any unwanted difficulty spikes.
- Cops have their vision cones increased in size, fines are now twice as expensive, cops take longer before they lose sight of you & police searches now take twice as long.
- Skins for the nighttime Dodge Charger as well as the Corvette cops have been changed up a bit.
- Got rid of the day/nighttime Corvette variants and instead added a Pursuit & Interceptor variants, both of which will spawn during pursuits.
- Heat levels overall take longer to increase.
- Police cars have seen some improvements to their vehicles, high end police vehicles now should be able to keep up with 400+ cars and should only be limited by their ability to drive their cars.
- Pursuits can be triggered at heat level 0. Just complete challenges during the night untill the heat is about 25% filled up or just honk at a parked cop and they should give chase.
- Patrolling cops have been removed since their driving AI sucks, as they crashed into everything and sometimes even into the player triggering a chase. They will however start spawning once your heat level is 1 or higher though. During free roam, you can still find them parked at gas stations and such if you want to trigger a chase.

BONUS: The regular version of this mod also increases REP requirements to level up by 50% for all 50 levels, since I thought it went up a bit to fast. There is however a bonus version included without this in case you don't want this. Also included it since I don't if this would feck up the progression for those using the awesome heat+ mod which bumps up the level cap to 70.

The Heat Levels:
Also note, the heat x.5 refers to the fact that heat levels have two stages. The first 'basic' stage is whenever your heat increases. The second 'extreme' stage activates once your heat level is halfway up to the next heat level (for lower heat levels it's a bit earlier). When going to the second stage, you'll notice the difficulty ramp up so you can consider their being 10 heat levels, spread across 5 'main' heat levels. (example: helicopter starts appearing at heat level 3, but only once you are at the halfway point or higher)

NO HEAT
+ Bribes
+ Parked Cops

HEAT LEVEL 0 (trigger this level by filling up the heat bar 25% by completing challenges during the night or simply honk at a parked cop car a few times to aggitate them)
+ Pursuit Range (cops can now engage you in pursuit, pursuit range refers to the red circle on the minimap, at this level it's only 50 units large)
+ Blocking Tactic (cops try to get in front of you and slow you down by blocking your path)

HEAT LEVEL 1
+ Ford Crown Victoria (standard cop cruiser, tops out at 250 kmh)
+ Ambient Patrols (cops will now start appearing and patrolling the map looking for you)
Pursuit Range x100

HEAT LEVEL 1.5
+ You can no longer bribe the cops when they spot you
+ Backup will get called in to assist lone officers, time between backup calls is 40 seconds.
Ford Crown Victoria (x2 units)
Pursuit Range x150
Ambient Patrol Multiplier x2

HEAT LEVEL 2
+ Dodge Charger (faster cop cruiser, tops out at 300 kmh)
+ PIT Manoeuvre (cops will attempt to spin you out, though wonky physics don't really allow this)
Ford Crown Victoria (x2 units) 
Pursuit Range x200
Ambient Patrol Multiplier x3
Backup Timer 35 Seconds

HEAT LEVEL 2.5
+ Spike Strips (10% Spawn Chance) 
+ Grinding  Tactic (cops will drive up next to you and grind into your car)
Ford Crown Victoria (x2 units)
Dodge Charger (x2 units)
Pursuit Range x250
Ambient Patrol Multiplier x4
Backup Timer 30 Seconds

HEAT LEVEL 3
+ Ford Police Interceptor Utility (SUV unit, tops out at 320 kmh)
+ Barriers (50% Spawn Chance, these refer to roadblock made out of wooden and concrete barriers, sometimes with a Rhino in them. Only spawns in the city area)
Ford Crown Victoria (x1 unit)
Dodge Charger (x3 units)
Pursuit Range x300
Ambient Patrol Multiplier x5
Backup TImer 25 Seconds
Spike Strips (25% Spawn Chance)

HEAT LEVEL 3.5
+ Helicopter
+ Handbrake Tactic (Cops get in front and slam on their handbrakes to stop you)
Dodge Charger (x3 units)
Ford Police Interceptor Utility (x2 units)
Pursuit Range x350
Ambient Patrol Multiplier x6
Backup Timer 20 Seconds
Spike Strips (40% Spawn Chance)
Barricades (60% Spawn Chance) 

HEAT LEVEL 4
+ Chevrolet Camaro (Pursuit vehicle outfitted with a Killswitch device, tops out at 350 kmh)
+ Killswitch (Device used to shut down your car temporarily)
Dodge Charger (x3 units)
Ford Police Interceptor Utility (x2 units)
Helicopter
Pursuit Range x400
Ambient Patrol Multiplier x7
Backup Timer 15 Seconds
Spike Strips (55% Spawn Chance)
Barricades (70% Spawn Chance)

HEAT LEVEL 4.5
+ Rhino (30 Sec Between Spawns, heavy SWAT truck used to frontally ram you)
+ Sideslam Tactic (Cops driving next to you will slam into you from the sides)
Dodge Charger (x2 units)
Ford Police Interceptor Utility (x2 units)
Chevrolet Camaro (x2 units)
Helicopter
Pursuit Range x450
Ambient Patrol Multiplier x8
Backup Timer 10 Seconds
Spike Strips (70% Spawn Chance)
Barricades (80% Spawn Chance)
 
HEAT LEVEL 5
+ Chevrolet Corvette Pursuit Vehicle (High speed pursuit vehicle, recognizable by it's black and white livery, tops out at 350 kmh but does come with much faster acceleration than the Camaro)
+ Ram  Tactic (Self explanitory, cops coming up from behind you will ram into you)
Dodge Charger (x1 unit)
Ford Police Interceptor Utility (x2 unit)
Chevrolet Camaro (x2 units)
Helicopter
Pursuit Range x500
Ambient Patrol Multiplier x9
Backup Timer 5 Sec
Rhino (20 Seconds between spawn attempts)
Spike Strips (85% Spawn Chance)
Barricades (90% Spawn Chance)

HEAT LEVEL 5 MAX (Reach this level by continueing to stir up trouble at heat level 5)
+ Chevrolet Corvette Interceptor Unit (x3 units) (Tougher version of the regular pursuit Corvette, recognizable by it's black and gray livery. Comes equiped with a Killswitch devvice and tops out at 400kmh)
+ Tactical Alert (All cops on high alert, getting spotted outside of a pursuit instantly triggers a chase. All resources will be used against you, maximum roadblock spawn chances, no delays between backup waves,...)
Ford Police Interceptor Utility (x1 unit)
Chevrolet Camaro (x1 unit)
Chevrolet Corvette Pursuit Vehicle (x1 unit)
Helicopter
Pursuit Range x550 (This covers the whole minimap)
Ambient Patrol Multiplier x10
Backup Timer 0 Sec (aka, cop cars will always swarm you from all directions so only option is to outrun them all)
Rhino (10 Seconds between spawn attempts)
Spike Strips (100% Spawn Chance)
Barricades (100% Spawn Chance)

That's about all I can think of right now, any feedback or suggestions are always welcome.
But above all, have fun with the mod!