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free air

  1. E46 (1999 - 2006)
    I'm deciding between 2 10'' subwoofers for my 325i Convertible that I will install free air in the ski pass: 1) Alumapro Alchemy MX Free Air (Used in the BSW ib110 kit) http://www.bavariansoundwerks.com/product/507/196/BMW-E46-Subwoofer-System-E46-Convertible-M3-3-Series/...
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