Not sure how I missed this post, but I have the switch on my 500E. It has been great. With my bigger tires the system works very, very well. On the track its a godsend (just ask Curcio!).

It is one of the best upgrades I made to my car, I would recomend it to anybody.

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David Hendy
'97 Renntech E60RS
'97 GMC 2500 Sub' Diesel
'95 E300D
'88 300TE
'88 250TD
'84 L/Rover 109