Thread: I gutted my CAT and I love it!!!

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  1. #1 I gutted my CAT and I love it!!! 
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    I am beyond happy about going catless today. The performance improvement on my stock 08 is great and now I don't have to ever worry about that ****ty CAT converter getting clogged again. Has anyone else out there went catless? if so please share your experinece.
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  3. #2 Re: I gutted my CAT and I love it!!! 
    GT Level Member Supercharged99's Avatar
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    The O2 sensors don't throw a code as a result? did you replace the O2 sensors with some dummy sensors from ZZP or similar?
    1999 GTP...stock for now
    2007 Suburban...far from stock
    1991 GMC Dually...74k original miles. Work in progress. Far from done.
    1977 C-10 (my baby)...too many mods to list
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  4. #3 Re: I gutted my CAT and I love it!!! 
    Killa Bee Scottydoggs's Avatar
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    oh hes gonna pop a code sooner or later.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  6. #4 Re: I gutted my CAT and I love it!!! 
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    Quote Originally Posted by Scottydoggs View Post
    oh hes gonna pop a code sooner or later.
    My thoughts, too, unless he had some kind of wizardry up his sleeve and, if so, what said wizardry that was
    1999 GTP...stock for now
    2007 Suburban...far from stock
    1991 GMC Dually...74k original miles. Work in progress. Far from done.
    1977 C-10 (my baby)...too many mods to list
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  7. #5 Re: I gutted my CAT and I love it!!! 
    GTP Level Member wowitsfast's Avatar
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    I'm catless. I just deleted the rear O2 from the pcm. Reads complete on the deq (smog) computer

    Sent from my SM-N920V using Tapatalk
    Just a bunch of junk thrown together http://www.grandprixforums.com/membe...ht=wowitsfasts
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  9. #6 Re: I gutted my CAT and I love it!!! 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    When the code pops and the car starts doing random cat tests that use up more fuel, he may wish to install a new cat converter.

    Can't tune 2008 3.8 computers either.

    SMGPFC Member #1
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  10. #7 Re: I gutted my CAT and I love it!!! 
    Donating Users bandook's Avatar
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    He might have needed a new cat anyways, if he noticed such a performance difference by gutting it.
    Top Swapped 01 Imp
    VS (very small?) cam, SD Headers, 2.8" pulley, self ported everything, E85, AEM water/meth, Deka 60's, HPT tuned
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  11. #8 Re: I gutted my CAT and I love it!!! 
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    Sounds like a job for a high-flow cat. People who express glee over having no cat seem to me like the guys who put the vertical pipes on their diesel trucks to put out extra black smoke.
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  12. #9 Re: I gutted my CAT and I love it!!! 
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    Quote Originally Posted by Supercharged99 View Post
    The O2 sensors don't throw a code as a result? did you replace the O2 sensors with some dummy sensors from ZZP or similar?
    Yes it sure did throw a code but I am in the process of installing O2 sensor extenders with the hopes of fooling the ECM into thinking it's reading cleaner exhaust.
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  13. #10 Re: I gutted my CAT and I love it!!! 
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    Car looks great! Can you delete sensors on a 08 model?
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  14. #11 Re: I gutted my CAT and I love it!!! 
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    Well honestly regardless of how much fuel it consumes from going catless. I won't regret gutting it because that's one less future problem I have to worry about and this isn't my only vehicle that I depend on for transportation. So I'm cool with a little decreased fuel economy.
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  15. #12 Re: I gutted my CAT and I love it!!! 
    Killa Bee Scottydoggs's Avatar
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    i'd try the simulator trick, if that dont work i would put a real cat back on it. cant delete codes in a 08. cant tune it.

    its not just wasting fuel, its flooding the engine making it run rich and fouling out the plugs.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  16. #13 Re: I gutted my CAT and I love it!!! 
    GXP Level Member GTPpower's Avatar
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    It's not going to foul the plugs. It will eventually ruin the engine though. I ruined one because I couldn't delete the cat test.
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  17. #14 Re: I gutted my CAT and I love it!!! 
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    Well itís been 2 days since Iíve installed the 02 sensor extenders and so far no check engine light and I havenít noticed a drop in fuel economy. So far so good. Will continue to post status updates.
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  18. #15 Re: I gutted my CAT and I love it!!! 
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    Quote Originally Posted by GTPpower View Post
    It's not going to foul the plugs. It will eventually ruin the engine though. I ruined one because I couldn't delete the cat test.
    What do you mean by the PCM performing random CAT tests?
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  19. #16 Re: I gutted my CAT and I love it!!! 
    GXP Level Member GTPpower's Avatar
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    2001 and newer cars perform a cat test to check the condition of the cat.
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  20. #17 Re: I gutted my CAT and I love it!!! 
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    Ok I will do research on it but so far the check engine light hasn't come back on which means the 02 sensor extenders must be allowing the correct exhaust tolerances to satisfy the PCM
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