True duals

Discussion in 'Performance & Fuel' started by Z71_usmc_rebel, Jul 17, 2008.

  1. Z71_usmc_rebel

    Z71_usmc_rebel Rockstar ROTM Winner 100 Posts

    If i was to go to my local muffler shop and have them remove all the piping from the headers back then re pipe my exhaust to be true duals with just flow master mufflers and no cats...would that mess with my O2 sensor readings? my state doesnt have emmisions checks so i dont have to worry about that...
  2. retired2001

    retired2001 Epic Member 5+ Years 5000 Posts

    Yes, I think. I guess they still have two on each side for calculating fuel / air mixtures for the computer.
  3. omegafiler

    omegafiler Epic Member 5+ Years 500 Posts

    Yeah, you need the cats and O2 sensors there, otherwise it'll throw a code, and can negatively effect performance as well.

    The cats already flow pretty darn well on these trucks. And what little restriction they do have is actually beneficial as it provides some much needed low-end torque. Our trucks aren't exactly light! Just go with a cat-back system. You can get that to sound pretty darn loud if you want it to.
  4. ct9a

    ct9a Epic Member 5+ Years 1000 Posts

    If you really want to run without the cats, then a quick and easy way to avoid throwing a code is to put the second O2 sensor on a spark plug extension and then plug the spark plug extension into the piping. I picked one up at Checkers for less than $5. Just make sure you get one with the right threads.

    I did this on my race/street car that I had a standalone ECU in, with a wideband O2 sensor, so I'm not sure what doing this to a vehicle without those things will do to your air/fuel mixture.
  5. JKEY817

    JKEY817 New Member

    It will sound mean as hell!
  6. GaryL

    GaryL Epic Member 5+ Years ROTM Winner 1000 Posts Platinum Contributor

    You can buy O2 simulators that plug in where the O2's did and the compmuter won't know they are missing. The simulator sends the computer what a normal working O2 sensor would send on stock running vehicle.
  7. Z71_usmc_rebel

    Z71_usmc_rebel Rockstar ROTM Winner 100 Posts

    hmm i didnt know that... im gonna go with the cat back...i dont need to lose performance or gas mileage..but i was just wandering what it would if i did only straight pipes back! thanks guys

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