Hmm.. Have the BSH intake with the DV relocate on mine, never heard a whistle sound, also never heard it with the intake before I installed the relocate. Sorry I know that is not much help...
I have a DV relocate, using a Neuspeed front section and BSH rear. The elbow has a "short" MAF mount. I also run one of these in front of my MAF -
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No whistle, no gurgle, no raking, good LTFT and mileage, no worries.