sorry my mistake, I was thinking of bying a soarer originally so that must have been where I saw it. Mind you it must have this tems that you are talking about and if so it must have some sort of adjustable dampers with fluid or air in them, mind you the lexus dealer did mention air so it is probably that.
I think I will take it to a quick fit garage for a laugh and whilst hes checking the exhaust up on the lift I will see what I can see, mind you hes bound to say it needs a full new exhaust system even though theres nothing wrong with it, they always do. In fact I remember a mate who had one fitted by them at one outlet then took it to another a month later, when the mechanic said he needed a new back section he just laughed and showed him the receit with the twelve month guarentee and said get on with it.