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I'm not an expert with EGTs but from my personal experience I've never seen high temps with a stock tune and exhaust. I believe your issue is the MAP sensor located on the intake horn.
I had the exact same symptoms after a stock emissions off tune on my 2022. You need to change your map sensor and possibly plug your throttle valve back in afterwards depending how it reacts with the new map sensor. Open a support ticket with your tuner and they will tell you the same thing I...