Just wanted to update this thread to let you know the car is finally driving straight and smooth. I can only assume that it was related to the crappy Falken Ziex 512s I had. The only thing I replaced was the tires with Toyo Proxes TPT 205/55/16. Also, these tires are the best tires I have ever had on my car since the day I bought it 10 years ago! Very grippy and great in the rain....look awesome too.