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034 HFC advice?

Discussion in 'Audi S4/A4/A4 Cab (B7 Chassis)' started by jakeA42T, Sep 6, 2012.

  1. jakeA42T
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    jakeA42T Member

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    [Sep 6, 2012]
    Was thinking of fitting a 034 HFC, needed a litte more info' if anyone has fitted one did you notice any difference in gains or sound?
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  3. HEKTOR
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    HEKTOR Member

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    [Sep 6, 2012]
    The gains will be minimal as ideally you would require mapping to get the full benefits.

    As for sound, it should help release a little more noise.
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  4. jakeA42T
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    jakeA42T Member

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    [Sep 6, 2012]
    Every little helps, Cheers?
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  5. Marrow
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    Marrow Member

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    [Sep 6, 2012]
    There are gains with any hfc with out mapping but to get the best out of it you need a new fuel pump and map to match.
    Noise wise it will be very raspy it not a noise everyone likes !!
    #4
  6. spider74
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    spider74 Member

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    [Sep 6, 2012]
    I'm assuming we are talking about the high flow cat? Its got to be quieter than a test pipe (De-cat) right? When i fitted my decat it was like another map the restriction is obviously high with the stock cat. Has anyone actually fitted a high flow cat to the b7? im interested too as it would make things easier come MOT time. I have a full 3" decat now with milltek and ko4 shoving out nearly 340ps so even if this dropped 10ps over the full decat its still gonna be a worthwhile mod for the cash and lack of hassle putting your cat back on every year?

    love to hear if anyone's fitted it?
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