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  1. 1st Gen. 1 Series (2004-2013 | E81, E82, E87, E88)
    I'm buying cone air filter strictly for the sound not for performance! I'm wondering which size I should buy, just the filter, I'll use existing hose with MAF sensor, do I need diameter reduction ring, I'm not very mechanically inclined and I don't want to purchase a filter that doesn't fit...
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