[mstnggt66]

Before you all get your panties in a bunch. I know that there is suppose to be no difference between the ZSP and non-ZSP on an XI. Throwing it out there, done.

My 2008 328xi coupe ZSP was in service for two weeks (radio issue, don't ask). During that time, I had a 2009 335xi coupe non-ZSP. Both were 6 speed manual, had Continental tires, same size and style rim.

Now, since I was able to drive the '09 for such a long time I was able to use it on roads/highways that I know how fast I can go around a merge or exit ramp. The non-ZSP 335xi definitely had more body roll than my ZSP 328xi. On one such highway ramp where I confidently push my own car to 50mph, the non-ZSP coupe showed significant body roll at 35mph.

Ok..non-scientific, no data...go ahead and bash.