VIBRATION AT HIGH SPEEDS
Problem - When driving at high speeds, the car develops a vibration.
Possibility 1 - Are the wheels and tyres stock. If not, they maybe the wrong size, dimensions etc for the car.
Possibility 2 - The car needs a wheel alignment.
Possibility 3 - Check tyre pressures.
Possibility 4 - Are wheel nuts tightened correctly. They may be loose.
Possibility 5 - Are wheels weighted correctly.
Possibility 6 - The clutch can contribute to vibration.