Yes, there is plenty of well developed engine tune software, but the car is much more than that. The stability control is HUGE. And is is dependent on many subtle things such as vehicle weight, balance, traction, HP and a lot more. Factory developers can assess each factor and have a software package that is almost custom to each car config. (Some assumptions on my part here.)
I am not expert in any of this, but I believe the reason that many modded cars become beasts is because they out-hp the stability control program for the car.
I’d like to hear the experts chime in!