alot of the engine noise on these trucks comes from the engine fan it is turning super fast when you are around 50 and it makes alot of noise. I drive my truck at 50 and it does generate a good bit of noise and for someone new it is so different than any civ vehicle it can be disconcerning. I have had mine to 60 before (that is where the governor kicks in) I didnt keep it there, but I had driven mine at 55 for a long period before.