The stock cars it was OTS from big names. The search feature on this forum sucks but there are a few posts here.
The big turbo cars custom tunes, someone had to find out how much too much torque is or when it runs out of fuel etc. People in my area are very experimental.
We can only appreciate that experts like George Smooth sacrifice their time and expensive engines to see and to tell us how much torque and HP are possible. We always need such extraordinarily brave tuners. Thank you for that