Has anyone noticed a hissing sound on their 1999 323i (E46). The sound occurs when you take your foot off of the accelerator at crusing speeds (40-70 mph)or when I change gears at the same speeds. I took my car to the dealership but they don't know what's wrong. They don't think that it's my clutch because the sound occurs while I'm crusing. The tech at the dealership told me that it might be my tires but he's not sure because the car's so new. Does anyone experience the same problem??