Thread: Cat Rattle
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Old 01-31-2011, 12:01 PM
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Your truck has 4 O2 sensors. I'm surprised you don't have a MIL lamp on with a rattling cat at this point. Hollowing out the cat's may provide a minor performance increase but I doubt you'll hear a big difference in the exhaust tone. Gutting the cats can cause a MIL to come on but there are ways to fool the PCM into thinking it's there.
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