Originally Posted by EMPOWERD
In terms of performance... the 330i with the "ZHP" M-Performance Package (not M-Sport). Numerous factory installed goodies to make it quicker including cams, higher rev-limiter, LSD cooled diff, suspension mods, etc. I've got a mint one for sale this week (PM me for details). For more info click here
I believe only the M3's came with a LSD.
They are nice cars though detailed info can be found here,