Removing cats

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

  1. blueZ71

    blueZ71 Rockstar 100 Posts

    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 Epic Member 5+ Years 500 Posts ROTM Winner

    install dummy sensors i guess
  3. silveradotrailblazer

    silveradotrailblazer Epic Member 5+ Years ROTM Winner 5000 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 Rockstar 100 Posts

    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 Epic Member 5+ Years 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 Epic Member 5+ Years 500 Posts

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

    mjalstad Rockstar 100 Posts

    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 Epic Member 5+ Years 500 Posts

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