Looks like we have about the same truck, red sport, mine is a 14 ,just about 80KM.
I have hearing aids , blue tooth to the lap top ,and phone, But when I crank the sound up, that hand noise or handling the phone is just too much, so can't really say.
My wife hears stuff all the time.
I would check the manifold as was mentioned, I have never had any problem , so far with any of mine.
And if you just bought the truck , I would change the oil and filter, I just run the standard 5/20 full syth. BTW , temp out side now is -31 and getting colder. 9.30pm Coffee time. Welcome.
In Sask.