Thanks John.. I doubt the paintwork has faded noticeable, although a quick mop would fix that
I was under the impression that the suspension was 'adaptive', which would lead me to think there is some kind of control unit for it. Changing the dampers & springs would upset this calibration (if it does exist) - that was the reasoning for my question.
I'll have to wait and see what SRT bits pop up - perhaps easier now the SRT-D is available