Two years ago I began to use Nokian snow tires, and toward the end of the second winter season (last Feb-March), my 744 NA began to vibrate/rumble from what hears like the front left tire when I am on the highway at 55 and above only when I bear to the right. I took õhe car to the place where I got the tires to see if there was a problem with the tire (defect or whatever) and they said no. We also switched the front and rear left tires and that solved the problem for now. However, I do hear a kind of clunk in the steering sometimes when I make sharp turns at low speeds or when I am making a circle in a parking lot. I am wondering if this has to do with struts or steering rack. Any thoughts would be appreciated.