In the sport package (besides the seat and tire changes), I know the springs a shorter with a higher rate; the front sway bar is thicker; the rear sway is the same?; and are the shocks stiffer?
Just came from the dealer and drove 328i sport/non-sport back to back. Unfortunately this was only a 3 mile loop around town and still could not get a full appreciation for the difference.
If the differences are minor I will keep as an option to switch to the sport package suspension later with factory parts (if only a spring/sway bar change) if standard proves to be too soft in the long run.
Thanks for any and all information.