I have been to the track twice. Ran 12.3s with the exhaust cutout closed and 12.2s with it open. My starting intake air temps were definitely lower, strangely, pretty much exactly 5 degrees C lower. I did not expect the change to correlate so closely with the coolant temperature.

I did not have my IC coolant reservoir installed. I had removed it for a very pleasant road trip in the mountains of North Carolina I took with my wife. That affected IAT a lot too. Comparing my data logs to prior runs, the IAT was stating 5 degrees C cooler, but ending 11 degrees C higher than before. 38 C to 74 C. That tank makes big difference. 43 C to 63 C would be typical before. It is back in now, but no logs yet.