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      01-13-2018, 01:20 PM   #1
1junkie
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Drives: 2012 BMW 135i Convertible
Join Date: Mar 2017
Location: Georgetown, KY

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Surging boost sound. Any ideas?

I'm sure there is a post about this but I can't find it. When I have the car in sport mode with dct in manual mode I get this surging/fluctuating boost sound but it doesn't really seem to affect the power delivery. Is this normal? I do have an AFE intake if that makes a difference. Oh and PPK but it did this before the PPK install.
Appreciate 0
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