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cat converter

  1. General
    I have a 2008 Trailblazer that needs a catalytic converter. I have read several posts on here about people having success with some after market converters like Mangaflow and Walker as far as not throwing the code again after being replaced. I also read others still had problems. These posts...
  2. OEM Issues
    My ‘02 envoy has a misfire I have change the spark plugs and set gap to .41 ~42 and coil packs the cylinder is getting spark I even took the spark plug out put another in take the ignition coil out set a ground wire to the spark plug and put the plug on the ignition coil out side of the cylinder...
  3. 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...
  4. 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...
  5. 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?
  6. 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
  7. 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...
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