so my car makes this noise when i drive that at first didnt bother me, but now i think its getting worse or its just aggravating me more... its like a humming/ droning noise coming from the front of the car. it actually reminds me of the sound trucks/jeeps with VERY aggressive tires make when they drive. it corresponds to the speed i am traveling, not engine speed, so i know its not the exhaust. i originally thought it was the blizzaks i was using as they seem to be "knobby" tires, but now that i have the NT555's back on it still happens. i think its the wheels bearing in one or both of my front hubs, but im not sure..can anyone confirm or deny this thinking? also how much does the part cost? im not so much worried about the labor, because my friend is a mechanic and will let me use his shop. i just dont want this to be some 200-300 part for each side cause one of my ball joints is starting to go too.