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broken bypass valve

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  1. 9-3 Sedan, Cabrio '04+, Combi, 9-3X Workshop
    :confused: I installed my intake i felt the drastic power increase instantly the next day it was back to stock like the ecu didnt learn it and went back to slow ? lol in addition to that my factory BPV is deffinetly broken because its not making the crisp whistle psh sound that it was before and...
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