I have the ETS 5" intercooler and there's no extra whistling. Re-check the install, agreed it's probably a leak somewhere.
Might be worth it to check the charge pipe too ... those are known to crack in the N55.
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2024 BMW M3 Sedan Frozen Pure Grey II/Fjord Blue, 6MT
Past: 2021 Z4 M40i Frozen Grey II/Black Alcantara | 2017 F30 340i Mineral Gray/Coral Red, 6MT | 2011 E92 335i Le Mans Blue/Black, 6MT
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