My RPM goes up when I steer when parked as well. I didn't notice it until I added a catless exhaust but I think it was because of the increased noise with the rev increase. My Evo did the same thing. I think its normal. On the other hand, the whistling sound may be an issue.
'13 35i M-Sport X3 | JB4 Stage 1 | BMS Intake | H&R Springs | Gloss black grill | CF Wrap and Coded by me | Recaro Child Seats
'15 M3 DCT AW/SO | JB Stage 1 | RKP Diffuser | P3 | M Perf Spoiler | iND Exterior Trim | Recaro Child Seat