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what function do this component have?

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    #1

    what function do this component have?

    Not sure if this device has been covered.
    What does this do?
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    #2
    What does the BMW secondary air pump do?
    https://bimmertips.com/what-does-the-bmw-secondary-air-pump-do/
    What is the purpose of the secondary air pump? The primary purpose of the secondary air pump (SAP) is to reduce harmful emissions.  Hydrocarbon (HC) and
    '05 M3 Convertible 6MT, CB/Cinnamon, CSL Airbox&Flap, PCSTuning, Beisan, Schrick 288/280, SS V1's & 2.5" System, RE Stg 1&SMF, KW V2, CB PS, Apex EC-7R

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      #3
      Secondary air pump. Helps heat up the cats faster during cold starts

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