Gutting Catalytic converters - Page 3
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This is a discussion on Gutting Catalytic converters within the Engine Performance forums, part of the Tutorials & DIY category; Okay then. Got it. So do you have to do anything to the o2 sensor....

  1. #31
    Registered User mike3026's Avatar
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    Okay then. Got it. So do you have to do anything to the o2 sensor.

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  3. #32
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    Quote Originally Posted by mike3026 View Post
    I finally got around to getting the 2.2k Ohm resistors. Now, I know to replace the o2 sensor in the uppipe, but there is the main o2 sensor in the main exhaust piping. There are 4 wires running from it. Does anyone know if that o2 sensor matters and if it does, which 2 wires require the resistor?
    The resistor only works for the EGT in the up-pipe. The 02 sensors post turbo (there should be two btw) cannot be fixed in this manner. You have a couple of options though. 1. Most commonly reccommended. Get your self a Cobb Access port. Use it as engine management and use it to clear the check engine lights. 2 Get your self 4 18mm spark plug non foulers install them in the bungs where the o2 sensors go then reinstall the o2 sensor the sensors will be getting a smaller sample and not throw the check engine light. 3. There is another form of wire resister to use on the o2 sensor wires. I havent done much research on this so you can if you would like. Im typing this fast so I may edit later any questions ask.
    02 WRX Wagooone!
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    it was crazy! I stabbed it about 10 times in the jugular and it was still teying to run around. I had the guy who hit it hold it's hind legs... he told me I was crazy. I just didn't want to see it suffer...
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  4. #33
    Registered User Black X Dahlia's Avatar
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    Quote Originally Posted by mike3026 View Post
    Oh okay there's a hidden cat the factory manual doesn't tell you about on that pipe from the header to the turbo.
    if you have an 04+ STi or 06+ WRX then there are only 2 cats. The 2.5L engine got rid of the cat in the Up Pipe, leaving the Cat in the DP and your Cat converter
    How Fast Can You Afford To Go?

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