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  1. 07-07-2008 05:27 PM #1
    mwbunns4
    mwbunns4 is offline
    Veteran Member Three Rings mwbunns4's Avatar
    Join Date
    Feb 20 2008
    AZ Member #
    25490
    My Garage
    2011 Audi S4 6MT, Audi A3 TDI
    Location
    Savannah, GA

    straight pipes or cats???

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    i recently installed my aftermarket downpipes and they came with high flow cats and test pipes. i installed the test pipes. i was wondering, what would be the difference if i installed the HFC? would i lose power? would it make the exhaust sound different? i am more about performance, but the CEL is getting annoying. any input would be great.
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  2. 07-07-2008 05:34 PM #2
    sweed
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    Senior Member Two Rings
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    Dec 12 2007
    AZ Member #
    23295
    Location
    Boston

    Re: straight pipes or cats???

    keep the test pipes in and put a piece of electrical over the cel! haha
    what dp's and catback do you have? like it?
    2001 S4
    Stage 3 totaled...

    new- 2001.5 Nogaro
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  3. 07-07-2008 05:37 PM #3
    GramCracker
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    Mar 11 2007
    AZ Member #
    16317
    My Garage
    1990 R32 GT-R
    Location
    Somewhere in CT

    Re: straight pipes or cats???

    Judging by the fact that he got test pipes and HFC's, I'm going to say he got SSAC.


    Past:
    2020 RS3 - Paint Code 312
    2012 Ibis White TTRS
    2001 Cactus S4 Avant
    2001 Imola Avant
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  4. 07-07-2008 05:55 PM #4
    RolledMySTi
    RolledMySTi is offline
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    Jul 06 2007
    AZ Member #
    19342
    My Garage
    2001 S4 Sedan Laser Red
    Location
    San Jose, CA

    Re: straight pipes or cats???

    I say put in the cats. The air is dirty enough, you aren't losing that much hp and I hate being behind a stinky old car or one with no cats.
    01 Laser Red S4 Stage 3 | Vast Fueling | Clutchnet 6 Puck Disk with RS4 PP | APR Downpipes | Aluminum Flywheel | Neuspeed Exhaust | SRM Side Mounts | ECS Pulley Kit | RS4 Airbox | UUC Short Shifter | ST Coilovers| Samcos | AWE DTS Bar | JHM Center Diff | 034 Track Motor Mounts + Street Trans Mounts | Apikol blue rear diff mount and bushings | Areomotive Fuel Pump | ECS 2.0T Coil Conversion | Hooked on Meth
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  5. 07-07-2008 06:47 PM #5
    skunkoncrunk
    skunkoncrunk is offline
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    Apr 18 2007
    AZ Member #
    17388
    My Garage
    2006 Subaru WRX
    Location
    Cali/Colorado

    Re: straight pipes or cats???

    ^I agree.

    You could buy this though.

    http://vastperformance.com/shop/prod...products_id=68

    -Hooked on Meth-
    BOOSTADCT
    -Mike-
    Instagram: @mdundurs
    S4's Video (Watch in 1080p)

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