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cai filter air afe

  1. E39 M5 and E52 Z8 Discussion
    Greetings and Salutations! I am trying to clean the aFe CAI filters that were installed by the previous owner. I've never touched them before. The problem is, I can't figure out if they are the blue ones (Pro 5 R) or the grey (Dry) ones. Apparently it matters when I go to buy the cleaning kit...