What is causing my X5 3.0 to whistle during acceleration? past basic troubleshooting

[BMC530i]

Hi everyone, my 03 X5 3.0 with 61K is whistling during acceleration, the sound is mostly noticeable while accelerating from the stop until 15-20mph. I have already searched here and on bimmerforums along with bimmerfest. The air intake has no visible leaks or tears in it. Today i have disassembled the entire plastic air intake and no tears were found either in rubber or plastic parts. I feel that the whistling sound it's not normal as some dealers say. My 03 530i is not making any whistling sound. I know that some members have successfully eliminated the noise by replacing the plastic square box that is attached to the plastic intake manifold on the driver side. I'm bit hesitant to replace it until i could confirm that this part is causing whistling sound.

Please share your thoughts on what to do next. I feel that the extra air that is not metered by the MAF sensor is causing poor gas mileage along with other problems i have been experiencing lately. Last month the ECU threw a code for rich running condition. I've cleared the code and it has not come back yet. Yesterday, my transmission threw a dashboard warning light that i was able to reset by following the reset procedure from the owners manual. Two weeks ago the yellow traction control light along with ABS was illuminated as well. I have cleared the lights and they have not returned yet.

I enjoy the X5, but i don't like how the problems with components/parts have snowballing effect on those vehicles. A small variance in operating parameters on one part causes a handful of problems through out the whole car. A true challenge for home DIY.

Thanks a lot in advance