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Replacing Stock Dual Cats

Discussion in 'Performance and Tuning' started by Rob Lich, May 18, 2009.

  1. May 18, 2009 at 6:19 PM
    Rob Lich

    Rob Lich [OP] Member

    Apr 23, 2009
    I'm upgrading the exaust on my 2001 Tacoma 3.4L. I've been told from several people a catback isn't a good investment for my second gen. 3.4L, as far as increasing performance. I've got two stock cats on now, but it looks like the two sensors are connect to just one cat. I've already put on a Flowmax muffler, next I want to replace the two cats with one highflow cat, then put on some headers. Does anyone know a good highflow cat for second gen. Tacos?
  2. May 21, 2009 at 8:48 AM

    matthew5olson Well-Known Member

    Dec 21, 2008
    First Name:
    pittsburgh, PA
    04 ext cab 3.4L 5spd 4x4 sr5
    K&N cold air intake, doug thorley headers, rear sensor simulator, flowmaster 40 series, magnecor plug wires, Royal Purple synthetic gear lube, airaid throttle body spacer, Hyperground system, flex-a-lite elec fan.
    yours still counts as a 1st gen taco 95-04 2nd gen are 05-up. they run a 4.0L
    I have an '04. I removed my front cat when I installed my headers. Mostly because the inlet and outlet for both cats is 2". i am ordering a magnaflow highflow 2.5" cat today. It will be installed next week in place of my second cat. I can let you know then if it is a good buy. Here is a pic of how I replaced my first cat. However you would need to allow a place for your o2 sensor. My doug thorley headers ($600) had a place for it. Also I don't know if removing the second cat is going to throw a code. I removed the 1st one without any problems. The high flow cat I bought is OBDII rated but we'll see. see this post for a little more detail: http://www.tacomaworld.com/forum/builds/38130-gas-mileage-build.html#post623437

    replacement pipe for cat1.jpg
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