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Installing OBX headers, should i keep the CATs

Discussion in 'Performance and Tuning' started by 82dmc12, Jun 4, 2010.

  1. Jun 4, 2010 at 8:43 AM
    #1
    82dmc12

    82dmc12 [OP] Member

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    Ed
    Florida
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    07 TRD Tacoma
    Hello all,

    I have an 07 crew cab with the 4.0L. I want to install the OBX short headers and tie then into the pre-cats like the stock manifold. I'm good with fabrication and have my own tig welder so that should not be a problem. are the stock pre-cats very restrictive? I don't even plan on putting a performance exhaust on the truck. I just noticed what a poor manifold design the truck had and know adding short headers would be a huge improvment. I'm not looking for huge power gains but just simply want to correct an obvious fault.

    now i will consider upgrading the whole exhaust if it is comparible to the stock exhaust while riding in the cabin. Are the performance gains worth the money?

    My real goal is to improve my MPG by making the engine more efficient and add some lower end pickup too. I do a lot of Highway driving.

    -Ed
     
  2. Jun 4, 2010 at 8:58 AM
    #2
    BAMFTACO

    BAMFTACO Pabst Blue Ribbon on ice

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    JUAN
    Malibu, CA
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    Lift- stock suspension with light racing uppers,tc coil bucket gusset, timbern bumps ,defined extended shackles with shackle brace. Armor- custom tube bumper, kr fab rear bumper,trail gear wiy 78 in sliders Performance-intake manifold spacer, vibrant resonator Random stuff- kenwood head unit,b&m t shifter, hood bug deflector.
    Keep the cats and there are a lot threads why you should keep them
     
  3. Jun 4, 2010 at 9:00 AM
    #3
    My68ur8trd

    My68ur8trd Well-Known Member Vendor

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    Justin
    Williamsburg, VA
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    URD Catback | TRD CAI | TRD S/C | APR X-1 | DTLT | APR 2.85" Pulley |Fabtech 6" | Icon C/O | Alcan Leafs | 33 Grabber AT2 | 17" XD Addicts
    if it is staying FI, keep the cats

    if you plan to boost it, you could do without them. If you take them out you will need an O2 sim to keep the check engine light out.

    I have the long tubes, stock y ( cats still there), and the URD catback, and it is plenty loud under load, but pretty quiet cruising.

    Justin
     
  4. Jun 4, 2010 at 9:00 AM
    #4
    82dmc12

    82dmc12 [OP] Member

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    Good then because that's what i was planning on doing. I'll cut the cats off the stock manifold and tie them into the new headers. OBX has come a long way since their begining.
     
  5. Jun 4, 2010 at 9:04 AM
    #5
    BAMFTACO

    BAMFTACO Pabst Blue Ribbon on ice

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    Lift- stock suspension with light racing uppers,tc coil bucket gusset, timbern bumps ,defined extended shackles with shackle brace. Armor- custom tube bumper, kr fab rear bumper,trail gear wiy 78 in sliders Performance-intake manifold spacer, vibrant resonator Random stuff- kenwood head unit,b&m t shifter, hood bug deflector.
    You'd be suprised how good the stock cats flow
     
  6. Jun 5, 2010 at 7:15 AM
    #6
    My68ur8trd

    My68ur8trd Well-Known Member Vendor

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    Williamsburg, VA
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    URD Catback | TRD CAI | TRD S/C | APR X-1 | DTLT | APR 2.85" Pulley |Fabtech 6" | Icon C/O | Alcan Leafs | 33 Grabber AT2 | 17" XD Addicts

    it not so much a flow issue. some of the hot maps with the APR x1 will melt a stock cat.

    Justin
     
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