[Jaroslav Černý]

It's factory only. One thing to note in AC is that in replays you can see the fine throttle control but the brakes will only show as on/off. You'd have to ask Kunos why they did that.

Thank you that would definitely explain it. I will try test it but then again I know from previous experience that my own car in replay will probably have different data than opponents and thus making the test irrelevant.
The replays in AC are a total mess with huge sizes to kill it all.

What does OP mean? Is this set up issue being able to change it? One thing that looks weird in AC is the replay and live youtube videos, (not SRS fault) the cars look like they are drifting even if they are not. I watched my own replay once and my car looked too much sideways when cornering but I don't remember myself knowing how to drift... LOL Anyways, TC and ABS I can adjust them however I want and that's always been the case since I started here. I don't know if that's an issue or not.

A replay quality can be set in the launcher, though setting it other than default used to cause issues if you wanted to play the replay and have set different settings than what the replay was recorded on... oh yeah, endless AC replay issues But that is probably resolved now.
You can see cars "drifting", warping/teleporting because people connect to SRS servers with poor internet connections be it their latency is 100ms+ even but also jitter can make them warp unpredictably.
AC does not simulate opponent cars unlike LFS   As such it relies only on positions and basic parameters reported such as angles, that's it. Why are the replays then so huge compared to LFS? I have no idea.
As a result you can see cars cornering at weight angles, sliding all 4 wheels sideways quite often, if the opponent has poor connection then they tend to warp/teleport forward and back but may also teleport to sides when cornering = disasters when racing close.

AC has ABS/TC:

1. defined in car data for cars that have factory ABS/TC
   
2. defined in AC itself for servers that allow enabling them on any car when non-factory ABS/TC is allowed
   
3. on top of that AC also has hidden forced = unable to disable, helpers for braking, throttle, clutch, shifting when someone is using non wheel input in AC such as AC keyboard input maybe also gamepad input, but also if you do not have a clutch pedal, h-shifter, axle handbrake some of these will get enabled automatically without any control over it given to user (this is a big difference compared to LFS that was "raw" and didn't force anything on anyone and such helpers could also be force disabled/banned by servers as these features were reported during online session as to who is using them or not)
   
4. AC may report telemetry data to other applications, I do not know at what rate or if with any anti cheating delay but that is a clear way to cheat for sure if there is no delay and you get instant access to slip
   

That about sums up the 4 ways someone can have ABS/TC etc. in AC.