parametric

I read this was a relatively cheap option fitted to a number of Merc models. I'm looking to buy a 350SLK circa 2005 with it fitted as from what I read it is woth every penny. So how would I know if it is fitted? Is it a software upgrade on the standard electric unit providing the speed...

Wifes car has had heavy steering ever since she has had it, she thinks it fine but my steering is considerably lighter at parking speeds. Its a 2001 C320 with almost every option so i am assuming its got the fancy steering, anything simple that goes wrong with the steering? Lynall

Hi does anyone know about defects on this system :confused: ?? When i turn the steeringwheel left the powersteering goes like a warm knife thru´ butter but turned right it seems that there is no power at all. This is only when the car is not in motion. ????

First question, what is it? Second question do I have it?? 1997 W210 estate