When i go about 100km/h the car vibrates and makes a humming noise i guess. It doesnt vibrate much but the noise is very annoying. When i turn left the car vibrates more and gets louder, then i turn right, everything is fine, quiet, no vibration. I recently put new back tires on which were apparently balanced. for some reason im thinking its the front tires. Any suggestions with whats wrong, and maybe the cost of fixing it?