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I have read the 04 active handling is different from the 03 in that there is a more pronounced difference between the touring and sport mode. Is the difference in computer programming ? I have the 03 and can not tell much difference between the two settings.
Are you talking about the active handling or the F-45 adjustable ride. Active handling is like a skid control that can be separated from your traction control which is called Competitive Driving. The F-45 adjustable ride actuall changes the shocks for touring or sport driving. If it's the adjustable ride then there is a difference from 03-04. 04 get the magneticly controled shock fluid which reacts at a much faster then the old electronic valving of the 03. It's very similar to the adjustable ride that the C6 will have.
The F55 is the magnetic selective ride control on the 03. Not sure what suspension you have from your post. I have it on my 03 AE model and I can sure tell the difference in the ride between tour and sport. It is a very smooth ride on tour, rock solid on sport. Active handling is an entirely different animal as stated in the previous post. That is the computer taking care of you.