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catalytic converter

  1. Flowmaster Catalytic CA

    Exhaust Mods
    Hello all, 2004 Trailblazer. Hopefully someone can lend advice here, I need to replace my cat with CA approved replacement which means CARB compliant since I am in CA. There appears to be limited selection when it come to CARB units from most mfg. I found a flowmaster 3912024 that according...
  2. Slow acceleration

    OEM Issues
    Hi folks New to the forums so forgive me if this is posted in the wrong one. I have an 04 Trailblazer EXT LT 4x4 with the I6 and 177,000 miles. The problem I'm having progressively got worse over a period of a couple days after 2 trips of about 1400 miles total. I noticed at first while...
  3. 4.2L Exhaust Mod Clogged Cat and to much Drone

    Exhaust Mods
    Hello, I am in the process modifying my exhaust because I had a partial blocked Catalytic Converter for the 2nd time in 3 years. The first one went with 108,000 miles and the 2nd one had 160,000 miles on it. Not sure way they became clogged, I haven’t had any check engine lights on or O2...
  4. Code P0420

    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...
  5. [SOLVED] Catalytic converter PROBLEM!!!

    The 02-09 "How-To" and DIY Section
    I own a 2005 GMC Envoy XL 4.2. I found out recently that the CAT had to be replaced, so i bought a new one (Direct fit), in hopes to replace it myself. I was able to get the nuts off of the old one but now the darn thing will not come out! I was wondering if anyone had some help as to what i...
  6. [SOLVED] 2003 Envoy Severe Hesitation and Stalling

    just a note ...... i've solved a huge problem with my suv and it did alot of head scratching before i figured it out, here's what i did, i hope someone else finds it usefull..... Symptom: started out as intermittant loss of power then progressed over the weeks to hesitation and then sputtering...
  7. Where to buy CAT for XL ?

    Engine Tunes/Mods
    I'm looking for direct fit catalytic converter part of exhaust for Envoy XL 2006. Bought one from wUnderCarParts but it is for shorter Envoy and mechanic will not do cut and re-weld because of the difference in pipe thickness. Thanks for any tips
  8. I want it louda!!

    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...
  9. Cherry bomb performance cat

    TrailBlazer / Envoy Chat
    hey i got a thrush/dynomax muffler single in/dual out 3inch , 4inch tailpipe, i want it more louder, so i went to muffler shop, he said he could cut cat out and put a pipe in there and an o2 sensor, total price about $140. and there's a chance that the check engine light will still appear, so...
  10. catalytic coverter

    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
  11. How do you change a Cat Converter

    Exhaust Mods
    Does anyone have a good thread on how to change a Cat Converter for a 2003 Trailblazer. Also, any opinions on a direct fit vs. weld on type?