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cat converter

  1. General
    After replacing my sparkplugs (proper plugs and gap) and the catalytic converter, a few drive cycles later (about a week) I get a check engine light with code P0420.. I'm assuming they may have installed the wrong cat as this code states "inefficient cat.." So perhaps it was a "universal" that...
  2. TrailBlazer / Envoy Chat
    Hello again, 2nd forum of the day, but that is because I love your guys' knowledge. K so, I have dual exhaust on my tb. We went 2.75 in 3 out if i remember right. The cat-converter is still in place, and I was wondering what i could do to hear the car more. I have went to 2 places to ask for...
  3. TrailBlazer / Envoy Chat
    Hello, I was pondering whether to remove my catalytic converter or not, to increase the sound, one mechanic said it will get louder, another said you won't notice much difference unless the cat is plugged. i have an 03 tb ls 4.2l i6, with almost 140000km on it. What are your guy's thoughts?
  4. TrailBlazer / Envoy Chat
    hey so i wanted to take out my catalytic converter, is there a way of doing it without having a check engine light appear? I just want more noise. Thanks, again Martin
  5. Exhaust Mods
    Just bought a tb a month ago, 2002. I need a new cat converter, but originally accelerated nicely, and did not bog. twp weeks ago i cut off the resonator, and it was fine, a week ago, it began bogging, and, felt low on power, also yesterday on the highway i was doing 65 and suddenly when i...