Might be wrong, but I think you have the newer engine which is identical to the the 330ds. In that case, a remap can see near 290bhp, exactly the same as a remapped 330d LCI!
I think this is one of the biggest gains achievable.
Black 330d E90 LCI M Sport Saloon Auto. Privacy Glass, Cream Leather, 6FL, I-Drive/Nav/Bluetooth, Alpine hifi upgrade.