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catalytic converter
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  1. Install Guides/DIY
    I have a 2009 Cobalt LS with 148k miles. I've been having problems with additional exhaust noise coming from the passenger side only when pressing the accelerator. Took it took the dealer and they found that the front exhaust tube/catalyst pipe has a hairline crack in it. I haven't been able...
  2. Engine Mods
    Has anyone here ever gutted a catalytic converter? My car has been throwing a P0420 Catalyst System Efficiency below threshold code for a while now, gonna try gutting my cat to see if it helps at all. Has anyone ever done it before that can give me tips? Or is there a way to clean it that is easier?
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