I have a 1985 BMW 318i and i did some mods on it like a K&N Air Filter and a set of Eibach springs. Can some1 pleaz HELP me and tell me why my car is shaking and moving left to right when i hit 80 mph cuz i'm really freaked out about this and scared!!!
THANX
PEACE !!!!

1st :: Try and get u're wheels Balanced
2nd:: Check the Alignment
3rd:: Tune up

THANX Stageongalant !!!
But do u think it's also because my car doesn't have enought torque in it?
Because that's what someone told me once so i'm not sure?
But thanx for the great advice i''d never would have thought about those things.
PEACE !!!

Your car shaking at a certain speed has nothing to do with the torque your engine is producing. If one of or both of the front wheels also make noise when they shake, try turning the wheel to one side and then the other for and instant (change lanes) and see if it goes away, if it does it's a bad wheel hub bearing in the side that makes the noise. Wheel balance is a good possibility as well and possibly something to do with your suspension kit. After you installed it the car should be realigned and in some cases, ajustable camber kits must be installed because you altered the geometry of the suspension, I'm not sure that would make things shake but it could.