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  1. #1
    Senior Member Z28_Driver's Avatar
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    Sunset Orange Metallic
    2002 Z28 Hardtop

    Stock Exhaust size

    What size pipe is in the factory catback?
    Specifically the size where the y-pipe connects to the catback.
    Planning a cutout.

  2. #2
    Veteran pajeff02's Avatar
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    Black & Blue
    '02 WS.6 / '07 Suburban

    I never measured it... would guess it is at least 3".

  3. #3
    Veteran 35th-ANV-SS's Avatar
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    02 35th LE Camaro SS

    I have my stock catback in my basement so I took a measurement of the OD. It measured 2-3/4". Same with the tips. It seems odd, but maybe this is what 3" is supposed to measure.

  4. #4
    Senior Member Z28_Driver's Avatar
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    Sunset Orange Metallic
    2002 Z28 Hardtop

    Thanks 35th-ANV-SS. I thought it was 2.75. I have another car setting on my ramps and stands right now, but the band clamp failed between the y-pipe and catback. Since I have to order parts, I figured why not a cutout.
    Any recommendations on brand?

  5. #5
    Member bryceslu's Avatar
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    00 NHRA Formula

    Stock is definitly not 3"...2 3/4" sounds about right.
    94 m6 Formula - Sold
    2000 NHRA Formula - Always For Sale

  6. #6
    Member jetaws6's Avatar
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    1998 Trans Am Ws6

    I think its 2 3/4. When I put my 3" catback on a while ago I remember it was a bit bigger

  7. #7
    Veteran 35th-ANV-SS's Avatar
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    02 35th LE Camaro SS

    Like I mentioned, I actually measured it

    DMH or QTP I've heard good things about. I personally don't have one as my set-up is already ridiculously loud.

  8. #8
    Senior Member Z28_Driver's Avatar
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    Sunset Orange Metallic
    2002 Z28 Hardtop

    Quote Originally Posted by 35th-ANV-SS View Post
    Like I mentioned, I actually measured it

    DMH or QTP I've heard good things about. I personally don't have one as my set-up is already ridiculously loud.
    I'm running the stock catback and BBK headers and y without cats now. Its nice for cruising. But I think it needs to be a little or maybe a lot louder at times. Never heard of DMH, but I'll find them online.

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