Performance issue

Hi,
    I was making some tests with my ecoboost and when I was driving on sport+ and when you reach 120mph the car seems to lose power and became slow. Did someone feel the same?

Is this a limitation from Ford or just a bad calibration of the engine?


Please help.

Thanks!

I didn't find the right solution from the Internet.

References:
www.ecoboostmustang.org/forum/issues-problems/8297-performance-issue.html

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