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Stock Exhaust size

This is a discussion on Stock Exhaust size within the External Engine forums, part of the LSx Technical Help Section category; What size pipe is in the factory catback? Specifically the size where the y-pipe connects to the catback. Planning a ...

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    Senior Member Z28_Driver's Avatar
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    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.

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

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    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.

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    Senior Member Z28_Driver's Avatar
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    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?

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    Member bryceslu's Avatar
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    Stock is definitly not 3"...2 3/4" sounds about right.
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    Member jetaws6's Avatar
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    I think its 2 3/4. When I put my 3" catback on a while ago I remember it was a bit bigger

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    Moderator 35th-ANV-SS's Avatar
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    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.

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    Senior Member Z28_Driver's Avatar
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    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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