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3" exhaust

Discussion in 'Performance and Tuning' started by grizzbear, Oct 11, 2012.

  1. Oct 11, 2012 at 7:45 PM
    #1
    grizzbear

    grizzbear [OP] Well-Known Member

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    got a sweet deal on a 3" exhaust cat back system what are the pros and cons of a 3" system on our trucks/
     
  2. Oct 11, 2012 at 7:53 PM
    #2
    grizzbear

    grizzbear [OP] Well-Known Member

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    what about back pressure?
     
  3. Oct 11, 2012 at 7:55 PM
    #3
    grizzbear

    grizzbear [OP] Well-Known Member

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    so just a little loss in low end power
     
  4. Oct 12, 2012 at 10:50 AM
    #4
    Speed Freek

    Speed Freek Turbo lover!

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    LS1-T56 swap, Z06 ported heads, cam, Titanium valves, Kevlar clutch. Currently under the knife for turbocharger..
    Big exhaust will cause loss of SCAVENGING not backpressure as most people are led to believe.

    You will lose some low end power, you might pick up a tiny bit on top. Not really good on a daily driver unless you rev the shit out of it.
     
  5. Oct 12, 2012 at 10:53 AM
    #5
    BAMFTACO

    BAMFTACO Pabst Blue Ribbon on ice

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    I have the urd 3 in catback and its not that much loss in low end.
     
  6. Jan 2, 2013 at 3:20 PM
    #6
    hotrod45

    hotrod45 Well-Known Member

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    which cat back did you buy? how does it sound and any drone? what was the special price and from who?
     
  7. Jan 2, 2013 at 4:09 PM
    #7
    skytower

    skytower Well-Known Member

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    There is a point where a larger size hurts instead of helps. Hot air flows faster, and with a larger pipe, it won't stay hot down the legnth of exhaust. Cooler exhaust=less scavenging(vaccum pulled on one cylinder, caused by previous exhaust pulse)

    Our engines are tuned for a stock exhaust and intake.
     
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