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High Flow Cat - seems an easy job

Discussion in 'Audi S4/A4/A4 Cab (B7 Chassis)' started by jakeA42T, Sep 3, 2012.

  1. jakeA42T
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    jakeA42T Member

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    [Sep 3, 2012]
    Have been looking at the HFC, do they really make a different?
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  3. razza1
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    razza1 Well-Known Member

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    [Sep 3, 2012]
    Believe so, they remove some of the restriction of air flow, thus can boost better.
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