It's actually rather beneficial and important. There are a few posts where people removed it and alternator died in high demand cars. I know the Technik ASA supercharged cars because of piping left this off. Several owners noticed their alternators died soon after. So a reroute and ducting of cool air back as originally designed by BMW was done.
It's often not noticed how important some designs are until when removed the difference they make.
OE CSL WHEELS - OE CSL BRAKES - OE AUTOFLD MIRRORS - CSL TRUNK - CSL DIFFUSER - AA TUNE - AA PULLEYS - AS 40% SSK - BILSTEIN PSS9s
CF CSL LIP - NAVI - BMWPERF CF STRUT BAR - BMW GROUP N MNTS - GRUPPE M CF INTAKE - SUPERSPRINT - UUC BRKLINES, TRANS, RTABs - H&R SWAYS - 4.10 M-SPORT DIFF