325xi wonders/shimmys at 80mph
 

02 325xi with 170k. When the car reaches 80 mph it starts to have a slight shimmey back and forth. Its not violent and the steering wheel doesn't shake, I can just feel the car swaying slightly. Brand new Lemforder control arms and ball joints. Also installed Power flex polyurethane FCABs new front tires ballanced and alligned all this done less than 7k miles ago. Can anyone give me some suggestions on what they think it might be? Would rtab's cause this?

RTABs would cause this. Also, go back and have all the wheels rebalanced as it's possible a weight got knocked loose.

Since you're going 80mph anyway, does the shimmy go away if you go faster? Is it present when you go slower than 80mph?

There is no shimmy up until 80mph and I have driven it faster than 85 and the shimey was still there. It doesn't feel like a wheel is out of balance. I guess I can throw it on the machine at work and check it doesn't hurt but its not really violent just a slight wonder.

so my rear struts are bad. I am not looking to lower the car or anything so where is the best place to buy replacement struts, and does anyone have a good package with replacement springs?

Bilstein rear shocks to replace the OEMs and you're better off with a set of Eibachs for ~1in or so drop. It'll be much cheaper and they last a lot longer.