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So I just recently got installed my catless DP, cat back exhaust, and rear motor mount. I also have an intake and BOV. It's been about two days now since having the DP and all the new stuff in and this morning has brought up the dreaded engine warning light. I'm relatively new to turbo cars (not that new have had the car for 2 years). Also on my AP it says the charge air pressure just raises whenever I'm at a stop (starts off near the ambient air temp and then whenever stopped it just beings to shoot up all the way close to 120F) just worries me a bit, and if anyone can help or give advice on maybe what it is causing the light? O2 sensor? Something else? Thank you!
 

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From my experience (2x Mustangs), whenever you go catless it automatically brings about your check engine light. There are tricks out there to remove these codes, however I always used a hand tuner (SCT) which allowed me to turn off o2 sensor codes.
 
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