From this thread I'm getting the impression that the LCI is quick enough without a remap!
Actually, I drove mine right after I'd driven an RS4, and it didn't feel any slower.
On the other hand, I drove the new M5 and then my 330d right after and it felt like I was driving with brakes on!
Black 330d E90 LCI M Sport Saloon Auto. Privacy Glass, Cream Leather, 6FL, I-Drive/Nav/Bluetooth, Alpine hifi upgrade.