I just finished lowering my car and while I was doing it I noticed that there was a little foam piece inside the sleeve that covered the strut. Do I need that foam piece inside the sleeve or is it ok to leave it out? A friend of mine said that it would be fine if I left it out but I'm not too sure. I was only lowering the front 1.75" and it looks like it was lowered 2". Could it be that I should've put the foam inside the sleeve?
that foam piece is probably your bumpstop. most people cut that piece in half and keep the wider section. I suggest keeping the bump stop in even if you don't cut them, it's the only thing that keeps your chassis from hitting the top of the strut if you bottom out. if you just got springs with no new struts then i'd cut a little less since the stock ones aren't made for shorter springs.