I didn't know BMW came out with a e90 WRX trim. Looks like there's only one option on flaps. No specific non-msport flaps, could be wrong.
https://www.realoem.com/bmw/enUS/sho...diagId=03_3666
LCI Mud Flaps look different too.
https://www.realoem.com/bmw/enUS/sho...66#82160444080