My Vectra C Sri 2.0 Turbo is now starting to make some new strange noises, more when I go over speed humps and it's coming from the left hand side front. I am also getting a slight squeaking noise from the same side when I am turning the wheel left only. So I am now thinking about getting some kind of lowering kit as I am thinking one of my shocks may be broke? Can anyone reccommend a decent lowering kit for my car. Whats the best height to have it lowered to? Thanks