What Carl says
The E90 M3 always had the coupe front end so when the standard saloon 'went' LCi, only the M3's rear lights/bootlid changed along with the CIC Har Drive based Nav system.
Pic below is my old LCi M3 (2010 car) to give you an idea of what it should look like - you will have to get a genuine M3 bonnet as well as the front end is slightly longer than the usual coupe one and will be too short otherwise. Be careful of reps as they are usually designed to go on a non M3 car (ie: onw with a standard front bumper and wings)
None of the M3's ever received the LCi front end treatment.