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Do you have aftermarket charge piping? I have a Pure Turbo inlet and noticed the whistling started when I did that upgrade. The opening to the inlet isn't a perfect fit into the Intake pipe and I believe the to be my issue. Became louder after I put the Turner CAI on last month.
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2013 135i N55 - FBO
SOLD 2020 X3 Competition - Alpine white, dp + stage 2
SOLD 2018 LBB M2 FBO, Pure Stage 2 turbo
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