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Taking my car back in tomorrow to see if it can be replicated. Switched to stock intakes and the noise still occurs when colder out. Sometimes I have difficulty replicating the sound, but holding out hope that they can diagnose it. Something does not sound right that's for sure.
Thinking it actually sounds a lot like the secondary air pump whistle I have heard on E46's. Will see if they can replicate the sound. Told them keep it as long as they need as I have a spare car. Hoping they figure this out!
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2023 M3 Competition xDrive, Alpine White with Full Fjord Blue/Black interior
2022 Acura TLX Type S, Tiger Eye Pearl with Orchid White interior (traded in)
2019 Subaru WRX STi, Ice Silver (traded in)
2017 Ford Focus ST, Oxford White (traded in)
Last edited by Krisp97; 01-11-2023 at 05:06 PM..
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