the question is what are you looking to do with your car overall? Track it, show car.. there are plenty of vendors on here that can provide you with what you are looking for.
BMW E92 M3
EVOLVE Stage II | EVOLVE X-Pipe | EVOLVE E-Tronic Exhaust
Macht Schnell Stage II intake | KW V3 | Volk TE37SL | BMW Performance Spoiler
Apex Stud Kit