Thread: High flow Cat or Test Pipe?
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Old Mar 23, 2006 | 05:55 AM
  #11  
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Kai
Rotorphile.
 
Joined: Mar 2002
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From: Richmond, VA
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Typically P0420, "Catalyst System Efficiency Below Threshold"

You can buy a little electronic device called an "O2 Simulator" that can be wired in to fool the computer, allowing you to run a test pipe.
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