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  1. 04-17-2013, 07:24 PM #1
    dethinboots
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    Impulse Blue
    2005 a4 GTO

    strange metallic rattling

    I can hear a strange metallic rattling from around where my headers and mids meet. This only happens at low level accel and decel.other than this shes a missle... what could it be?
    2005 Impulse Blue GTO
    Kooks Longtube Headers (off-road mids) , SLP Loudmouth II Catback, Vararam OTRCAI, MSD Spark Wires, 238/242 .595, Trickflow 225cc Heads, SLP 25% UD Pulley, Breather, Elite Engineering Catch Can, 3200 TC,Hayden Trans Cooler, P&P TB, Dyno tune by Sunshine Performance
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  2. 04-18-2013, 03:33 AM #2
    pajeff02
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    '02 WS.6 / '07 Suburban

    My guess would be a heat shield that has come loose or is just resonating. If it was a stock 4th gen, and not a GTO, then I would also say that a catalytic converter may be in the process of breaking down.
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  3. 04-18-2013, 04:52 AM #3
    shawnalong
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    hi dethinboots ,did you find out the solution ,i am also facing something similar since last week online casino
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  4. 04-18-2013, 07:40 AM #4
    dethinboots
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    Impulse Blue
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    I also noticed that this only happens when isn at operating temp
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  5. 04-18-2013, 05:59 PM #5
    2002ssslp
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    Silver & Blue
    02 Camaro SS, 04 GTO

    Heat shield.
    My ride is a 2002 Camaro SS SLP #3296 with 30k, LTH, 3" Y, CME, Frost tune, K&N, ported TB, Blackwing lid, Bellows, MSD, Denso Iridium, and 85mm MAF, Bilsteins, Eibach springs, SLP strut brace, Adj. Panhard, TA Girdle, UMI, Pro 5.0, Nitto NT555
    My wife has a 2004 GTO with the rare SAP, 18" wheels, K&N Cold Air System, MSD, Ported TB, Frost tune, Denso Iridium, Flowmaster cat-back, 3200 Yank, 75k
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  6. 04-19-2013, 03:53 PM #6
    cammed goat
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    2004 GTO M6

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    Get underneath and check the heat shield above the midpipes.
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  7. 04-24-2013, 12:09 PM #7
    dethinboots
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    Impulse Blue
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    okay that might be it. I heard it could also be loose O2 sensors... Should i worry?
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  8. 04-24-2013, 06:04 PM #8
    cammed goat
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    Phantom Black Metallic
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    If the O2 sensors were loose, you'd probably get a code, if not a hissing noise if you were running factory exhaust. The heat shield could still possibly be partially attached to the floorpan but partially resting on the pipe.


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  9. 04-25-2013, 10:32 AM #9
    dethinboots
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    would removing it completely be a bad idea? will it scorch?
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  10. 04-28-2013, 11:28 AM #10
    cammed goat
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    Nah. I doubt it. My driver side was beginning to fall off and was scraping my driveway a few months ago. Ripped it off completely and no harm done.
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  11. 04-29-2013, 03:41 AM #11
    pajeff02
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    '02 WS.6 / '07 Suburban

    Converters get pretty hot. If the metal has rotted around the fastener, use a washer to re-attach it to the underbody.
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  12. 05-01-2013, 12:35 PM #12
    dethinboots
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    Impulse Blue
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    will do. Thank you all for the advice.
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