I had a vibration forever at between 55-65 mph. Balance and balance and balance again with results for short time. For the first time since I have owned my car, I had an amazing low speed drive through town with no vibration.

I currently battle a high speed vibration during braking and I have new brakes and rotors all around, new fluid, and all, and I thought they were related. (similar feel of head shake).

Car is tight now, fun to drive, and the braking has improved also. Perhaps cheap rotors were not the best investment but I was sure that new was better than old.

Bought some cheap LBJ's from ebay. $18 each. Some of the best money I have spent so far on my X fire