Well to be able to put original M3 pieces on your car is a little tricky. Since the E46 M's are widebody, it's not a simple bolt on in regards to exterior pieces. The easiest thing to do is to find some oem m-tech pieces that most resemble the M3 parts. The m tech pieces can either be found used somewhere or new at a dealer. Try one of the sponsors such as Eurostyle for maybe some used ones or give Mike at Maranello BMW a call for the maxbimmer prices.
BMW...Now you're playing with power.