Only new airflow part is for power steering as far as I know, I added that to my ZLE. Your coolant should not be doing that, oil either, unless maybe you’re driving in 100+ temps. Even then, coolant should be ok.
Cooling on track is one of the real strengths of the ZL1, world class. Are you driving in traffic, close to others blocking airflow to your grill?
Stock oil cooler should not and I think cannot be removed, it’s cooled by coolant circuit. You could run heater during sessions, that helps, but shouldnt need it.
Do you have a tune? If so that’s the problem.
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