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Anyone removed the cat on the 5vzfe and have actual performance improvements?

Discussion in '1st Gen. Tacomas (1995-2004)' started by Riptide, Dec 16, 2011.

  1. Dec 16, 2011 at 9:50 AM
    #1
    Riptide

    Riptide [OP] Knee Dragger

    Joined:
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    Richmond, VA
    Vehicle:
    99' Black Tacoma TRD 4x4 6 cyl Ext Cab
    Matching bed cover, soon-to-be 01 front end conversion
    Some motors love to breath and simply removing the cat (when / where applicable) increases HP to some degree or another - unless very dependent on back pressure. Anyone removed it for the first gen Taco's 5vzfe and have a power increase? I can imagine it's louder and possibly better sounding, which can be confused with an actual increase in power, but anyone maybe even heard of a dyno or VERY obvious performance increase?

    I have heavy towing in my future and any affordable power mods are very welcomed. I figure popping in a mid pipe / straight through pipe in the place of the cat should give me a worthwhile increase up top.

    Thanks folks! :cool:
     
  2. Dec 16, 2011 at 9:54 AM
    #2
    Riptide

    Riptide [OP] Knee Dragger

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    99' Black Tacoma TRD 4x4 6 cyl Ext Cab
    Matching bed cover, soon-to-be 01 front end conversion
    Gotcha. So would it be better to go with a high flow cat? Or is it even worth it?
     
  3. Dec 16, 2011 at 8:16 PM
    #3
    chickenhead

    chickenhead Member

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    I have removed mine on my 02 DC and gained about .5 mpg. I tow all the time, boats and trailers with no change in power. Its been gone for over 2 years now.
     
  4. May 8, 2012 at 1:05 AM
    #4
    Island Taco 808

    Island Taco 808 New Member

    Joined:
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    Oahu
    Vehicle:
    01 limited sr5 4x4 Lexus pearl white Tacoma
    grey wire mod to the diff lock, by pass day lights, lexus pearl white paint, 3 inch ultimate toytec lift with control arms complete leaf spring, removed catalytic converters, urd 02 sensor simulator for post cat, too much to list all.
    I have replaced my down pipe that hold both catalytic converters with a straight pipe, if u are going to do the same u will need to put a chip on your rear o2 sensor. Assuming u dont have smog checks its a great way to improve power and gas mileage. The o2 sensor simulator i used was from Underdog Racing development, also known as an o2 simulator, it tricks your ecu in to thinking the cats are still there and working properly. i kept my stock muffler and not much of a difference in sound but very noticeable when towing my bobcat especially uphill when i really need the extra power ... a good flowing air filter helps when u need that extra power as well. A cheap, easy and reliable way to do that is to get a universal round air filter like the lifetime warranty Spectre airfilter found at checkers. u can break the stock plastic tube off the stock air box and throw away your air box. Take the tube that u broke off and take the air box end and shave the lip off with a bench grinder and fit the after market air filter on. there u go it sounds good too.. (;

    the emissions tube going to the air box can be traced and removed as that only puts air from your gas tank in your engine...

    Hope those mods helped u out...

     
  5. May 8, 2012 at 2:23 AM
    #5
    Joshua1

    Joshua1 Member

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    support[​IMG]
     
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