Hi Guys, i would like to share solutions to previous wislings, squeaks and rattles i heard (for several months) when riding inside my 2000 X5 E53 4.4i, as follows:

1) Rattles at rear trunk - replaced worn weather strip and place double adhesive tape at back of license plate - solved

2) Whisling during fast speed - replaced worn weather strip of both front doors and replaced gasket of sunroof - solved

2) Rattles somewhere along front roof - easily wrapped cloth around my sunglasses - solved

3) Rattles during loud base volume of stereo - easily removed paper clips, ballpens and leatherman within pockets of my doors - solved

4) Squeaks at rear seat during bumps - i pulled up the rear bottom seat and found that one of the two middle seat belt latches fell inside the hole and was sandwiched between bottom seat and flooring. i inserted it back and placed grease on the two catches located at both sides of bottom seat - solved

Hoping the above will help some of you guys with same issues