What does it mean when people talk about droan and mufflers?

 

droan is the deep tone sound you hear in the cab going down the road that just um.. drones lol. you'd know if you hear it, its annoying as hell and when its bad it actually hurts to listen too. Its called drone cause thats what it does, grab a dictionary maybe, in there its "to make a dull, continued, low, monotonous sound; hum; buzz".

 

thanks, maybe i am kinda a rtard, i didn't even spell it right!