Thanks Rich, I'll give the dealership a call first off as if they are not happy I am not happy...all being well I'll read some more on the subject (linear/dual/progressive pros and cons) and seek some advise from the suspension guru. Thanks for your time, much appreciated
Oh, and I found a half decent step by step guide which helps the likes of me know what I'd be in for,
here
I get the feeling I ought to make this upgrade the priority over the cosmetic ones