I have read many reviews on the Z4 e89 35i & 35is and one question that keeps popping up is that it has no Limited Slip Differential (LSD) and the run-flats. Birds do a conversion for the Z4 e89 and have fitted the Quaife LSD to the 335i which has transformed the handling. I must admit I haven't driven the new Z4 e89 and can't comment on the handling, but I would like to know if anyone has installed a LSD (Quaife, Wavetrac, or M3 e92 retrofit) to the Z4 e89.
Birds Z4 e89 link:
http://www.birdsauto.com/models/z4-e89
Birds Z4 e89 link:
http://www.birdsauto.com/models/z4-e89