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Ever since I had these JBA Headers and off road X pipe installed on a 2014 Mustang GT 5.0, my air fuel ratio has been swinging from 12-16. Rear O2's have been deleted, new MAF sensor, and everything else WE knew to look for. Here is a link to the video showing how bad it swings... Please help!

https://youtu.be/p3PS9f_KIgI
 

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Ever since I had these JBA Headers and off road X pipe installed on a 2014 Mustang GT 5.0, my air fuel ratio has been swinging from 12-16. Rear O2's have been deleted, new MAF sensor, and everything else WE knew to look for. Here is a link to the video showing how bad it swings... Please help!

https://youtu.be/p3PS9f_KIgI
Who is WE?

Sounds like more tuning might be needed. Just a guess...
 

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Have you driven it much? Have you done the idle relearn? Which tuner did you go with? Does the engine idle fine otherwise? What does it do under normal driving?

The O2 sensors are farther away from the engine than their original locations and there are some O2 transfer function tables that can be adjusted to account for the increased distance. Some tuners make this change and some don't but my understanding is that the ECM will eventually learn the correct values on its own.

My guess is that it's learning fuel trims. If the engine runs fine otherwise then drive it for a while and see if it evens out.
 

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If it was not tuned after install sounds like the problem - I had amr headers and x pipe installed and had to have it dyno tuned to make it right with A/F and other parameters.
 
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