D3 XLR-V Headers
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Cadillac XLR-V Series Forum Discussion, D3 XLR-V Headers in Cadillac V-Series Forums; Does anyone had any comments about the d3 headers for the XLR-V? I am interested in purchasing and wanted some ...
  1. #1
    VforVictory is offline Cadillac Owners Member
    Automobile(s): Cadillac
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    Feb 2008
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    D3 XLR-V Headers

    Does anyone had any comments about the d3 headers for the XLR-V? I am interested in purchasing and wanted some feedback. thanks

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  3. #2
    deadringer's Avatar
    deadringer is offline Cadillac Owners Fanatic
    Automobile(s): Modified 06 XLR-V
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    Jul 2004
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    Houston, TX
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    Re: D3 XLR-V Headers

    I have a set sitting in my garage in the box... I just haven't had time to install them.

    They seem to be well made... I wish they would have ground down the welds on the inside, but I suppose that may be an excersize for the installer...

    I've bought things from D3 in the past and they seem fair... so if you're worried about them as a vendor I'd imagine the transaction should go well.

  4. #3
    zzilla is offline Cadillac Owners Fanatic
    Automobile(s): cts v-xlr v
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    Re: D3 XLR-V Headers

    The primaries are only 1 and 5/8 if you would like to know more I can contact you via e-mail or phone. Legalities prevent me from discussing this on a open forum right now.
    Thank you

  5. #4
    Dr. Design is offline Cadillac Owners Connoisseur
    Automobile(s): STS, XLR, STS V-Series, CTS V-Series, XTS....
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    Re: D3 XLR-V Headers

    Hello,
    Actually the primary sizes are 110% correct for the application the headers are intended for. This is a 4.4L motor and the exhaust ports on the cylinder heads are actually even smaller than the primaries.

    If there are any questions, please feel free to contact us.

    Thank you,

    Dr. Design
    D3 Cadillac


    Quote Originally Posted by zzilla View Post
    The primaries are only 1 and 5/8 if you would like to know more I can contact you via e-mail or phone. Legalities prevent me from discussing this on a open forum right now.
    Thank you

  6. #5
    chucks97ss is offline Cadillac Owners Member
    Join Date
    Jul 2005
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    Re: D3 XLR-V Headers

    I'd like to see some 3rd party before and after dyno testing on them. Anyone?

  7. #6
    deadringer's Avatar
    deadringer is offline Cadillac Owners Fanatic
    Automobile(s): Modified 06 XLR-V
    Join Date
    Jul 2004
    Location
    Houston, TX
    Posts
    152

    Re: D3 XLR-V Headers

    Quote Originally Posted by zzilla View Post
    The primaries are only 1 and 5/8 if you would like to know more I can contact you via e-mail or phone. Legalities prevent me from discussing this on a open forum right now.
    Thank you
    My car is going into Hennessey performance here in Houston to get dyno tuned... I'm doing a lot of things at once, so it'll be unclear what the headers contributed. But my mod list now includes:

    • Lingenfelter 176 Degree Thermostat
    • D3 cold air intake
    • D3 Headers & Cats
    • Exhaust baffle bypass
    • Front & Rear Hotchkis Sport Sway Bars
    • Forgeline 3-piece wheels
    • Michelin Pilot Sport PS2 tires

    I'll post my final dyno chart when I get it.

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