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Vacuum pump or maybe a HPFP getting noisy? You can take a length of fish tank air line, stick one end near your ear, and use the other end to hunt for the noise source. HPFPs are on the right side below the plastic intake manifold, and the HPFPs sit on top of the vac pump.
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'18 F80 Base 6MT | '19 F82 Exec DCT | '18 F82 Comp Exec DCT | '23 G80cx
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