(my98, impreza turbo) i have this when i turn right and the weight of the car transfers to front left wheel, i get vibration and feel it through steering wheel. no noises. the sharper the turn and higher the speed the heavier the vibration. also it does this when i turn slightly and the road is a little bit bumpy. brakes, wheel, tire are ok, changed outer and inner axel joints, nothing. i have 2 suspects, wheelbearing and front diff. it doesn´t make typical wheelbearing whining, but can a wheelbearing cause vibration?

 

Did you check track rod end and bottom ball joint. In my experience the wheel bearing would cause that vibration

 

front axel has been checked several times, no knocks there. so iguess wheel bearing is the issue.