Vibratiion

[scoobydoo15775]

Hi, I'm new to these sites, can anyone please help me I've got a BMW E36 323i SE AC Schnitzer. The problem I've got with the car is that I've got vibration when you reach 80mph I've taken the car upto 150mph on a private road and it's still there, it not affecting the way the car drives, its just annoying and as I'm trying to sell the car I won't to try and rectify the problem prior to me selling it, So any advice would be helpful. Thanks