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  1. #1
    Senior Member Three Rings eliTTe's Avatar
    Join Date
    Sep 15 2006
    AZ Member #
    11464
    Location
    Arlington, VA

    hey guys whats this hose thing connected to the airbox?

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    It runs up into the fender, not sure what it is for. It can't be for the SAI pump because I don't have one being a 2000. second guess would be for cold engine warm up maybe??

    Then: 1985 Audi coupe GT, 1990 Audi 90 sport, 2000 Audi S4 stage 2+, 2002 Audi TT 225.
    Now: 2011 Audi S4

  2. #2
    Veteran Member Four Rings mholme's Avatar
    Join Date
    Jan 29 2007
    AZ Member #
    15226
    My Garage
    08 S4 00 S4
    Location
    MD

    Re: hey guys whats this hose thing connected to the airbox?

    I think it has something to do with the noise filtration in the air box. It doesn't have anything to do with warming up the car and doesn't go anywhere in the fender. By the way, secondary air pumps are only on tips, regardless of year.

    Edit: It's a secondary intake, probably a safety feature in case the main intake get's blocked.

    Last edited by mholme; 12-15-2008 at 10:57 AM.
    08 S4- Stock SOLD

    00 S4-APR 93 Piggies Custom True Dual exhaust AWE DTS ECS/Bilstein Coilovers 710N's Samco TBB Omori 52mm boost gauge SOLD

  3. #3
    Senior Member Three Rings eliTTe's Avatar
    Join Date
    Sep 15 2006
    AZ Member #
    11464
    Location
    Arlington, VA

    Re: hey guys whats this hose thing connected to the airbox?

    ok cool. just wanted to make sure I didn't need to have it filtered or anything. thanks
    Then: 1985 Audi coupe GT, 1990 Audi 90 sport, 2000 Audi S4 stage 2+, 2002 Audi TT 225.
    Now: 2011 Audi S4

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