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.
'09 E90 M3 SG | VF620 SC | KW V3 | ARC Wheels w/AD08 | OnEighty Lights | BPM Sport coding | AA Catless Exhaust | BMW Performance Wheel | Recaro Child Seat
'13 X3 DSB with M Sport | JB4 Stage 1 | BMS Intake | H&R Springs | Gloss black grill | CF Wrap and Coded by me