ET Street R Bias Ply tire pressure?

Stock tune won’t allow you to “hurt” the car like that.
What people don’t know is that even with all the BS turned off, there is still “some” level of intervention.
If you’re really committed, try pulling the plug near the airbox next time (the one they pull when on the dyno). I’m reasonably certain that this will remove the remaining nannies.
Could be wrong but worth a try.

Thanks for the confirmation guys. Makes me feel like it wasn't so much driver ability. It felt like the PCM still had some kind of intervention, so I appreciate the confirmation.

Now I won't sweat trying to figure out how to drive around it, knowing that whenever I tune the car it should disengage that added protection.