I also get a whistleing noise, but only going about 75-80. I havn't taken it much higher sence the car only has like 400 miles on it. But I also wounder'd what the sound was. Oh, and has anyone else with a P5 noticed how damn loud wind noise is with the sunroof open? I think it's cause that roof rack bar is right there. I'm gonna take it off and see if it gets quiter. :mad: