Stick a heavier weight (say a 20" wheel and a spacer as opposed to a Rays) on the end of the arm and that will affect the rebound frequency and therefore the 'feel'
Steering feel/handling will be more affected by the change in unsprung weight of the wheel/spacer combination rather than the increased track width since this is what affects the damper characteristics more than anything
They are heavier than the "standard Rays" .................. standard Rays are super light ......... great for GO but there are better (IMO) for SHOW
http://www.350z-tech.com/zwiki/Wheel_Specifications#Wheel_Weight_Table
Another couple of pics ........ of the Z with new wheels rather than the new wheels on the Z .......... car is now dirty ........ raining here today
if you look closely you'll see Nixy's Sunset way off in the distance