On 2011-14 Mustangs, the PCM is located next to the fuse box in the engine bay:
This video will show you where to find the PCM: https://www.youtube.com/watch?v=r9I56njSu0I
On 2015+ Mustangs, the PCM is located beneath the fuse box in the engine bay:
The 'PCM number' we need for tuning purposes is labeled 'H/W.'
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