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Old Dec 16, 2006 | 10:11 PM
  #1  
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the passenger side cat on my 98 z28 has developed a very loud rattle, when i pound on the cat i can hear something inside the cat move around, has anyone experienced this problem and if so what was the remedy? looking at the system it appears that i am going to have to remove the entire system to cut out the old cat, if i do not replace the cat and just weld in a piece of tube, will i have any trouble codes
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Old Dec 16, 2006 | 10:16 PM
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The catalysts inside the converter is coming apart.
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Old Dec 16, 2006 | 10:45 PM
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any suggestions on what i should do??
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Old Dec 16, 2006 | 10:55 PM
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Replace it with a factory one if you don't want to worry about your check engine light coming on. If you gut it, your light will most likely come on with a catalyst efficiency code. Sounds like a good time for headers and a y-pipe.
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Old Dec 17, 2006 | 12:17 AM
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i got a letter from GM the other day saying that they would replace the LH and RH cats from the dealer for free if there was a problem with them. it was for 2002 5.7's only.
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Old Dec 18, 2006 | 10:29 AM
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Cat needs to be replaced. Time for high flow cats or you can get a stock like replacement from a low mileage ls1 from a boneyard.
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Old Dec 19, 2006 | 09:19 PM
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I have an 01 and i got the same letter. I dont have cats though so i doesnt matter
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