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Removing cats

Discussion in 'Performance & Fuel' started by blueZ71, Mar 12, 2009.

  1. blueZ71

    blueZ71 New Member

    How do I trick the rear O2 sensors (behind the cat) if I were to remove the cats on my 2000 silverado?
  2. heavy chevy

    heavy chevy New Member ROTM Winner

    install dummy sensors i guess
  3. silveradotrailblazer

    silveradotrailblazer New Member ROTM Winner 1000 Posts

    O2 simulators are the cheapest way if you can find them. Most people quit making them and some of the ones still made just dont work. A Diablo Preditor programmer has the ability to trick the ecm into not throwing a o2 code, but the rear o2 still has to be installd and plugged in. I run highflow cats on my 05 Silverado and they were throwing codes so I just turned the rear codes off.
  4. mjalstad

    mjalstad New Member

    X2 - either simulators, a Predator, or a custom tune. The rear O2's don't need to be plugged in with a Predator though.
  5. Jimmiee

    Jimmiee New Member 1000 Posts

    If you do remove the cats make sure you don't run the truck with the check engine light on because you will be operating in an open loop situation and your performance will suffer.
  6. CarpenterGuy

    CarpenterGuy New Member

    i'm lookin at getting high flow cats. it seems like less effort
  7. mjalstad

    mjalstad New Member


    No, you will be fine. It will run in closed loop. The second O2 sensor does not affect performance in any way, shape, or form. If you have a check engine light on, it will not make you go into open loop. I don't know where you got this information but it is totally wrong.
  8. Dr_Zero

    Dr_Zero New Member

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