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Z3 1.9l air filter box has what appears to be insulating material attached to the inside walls by means of a plastic mesh. This material is disintegrating and I fear that particles from above the element could be sucked into the motor. Should I just remove the remainder, or is it necessary to replace it, and if so, with what? Thank you.
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That's the sound insulation. Just remove it. I doubt you will even notice any increased noise level.
Thank you kindly.
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