My 2019 3.5l eco-boost runs and drives great all the time but occasionally I get a loud roar while accelerating that sounds similar to when I rented a Mustang while on vacation and I think they pipe engine sound into the cabin. The truck is completely stock.

 

try turning the radio off.

 

I remember flipping the lid of the air cleaner over to get that roar from my Holley 4 barrel. Now Ford pipes the sound in through the audio system.