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Secondary Cat delete

Discussion in 'Performance and Tuning' started by BenJammn5, Nov 15, 2010.

  1. Nov 15, 2010 at 9:25 PM
    #1
    BenJammn5

    BenJammn5 [OP] RN

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    Obviously living in California, and been thinking about removing the 2nd set of cats. I know, the 02 sensor is in front so shouldn't throw a code, but the question- would I still pass smog?

    thanks dudes
     
  2. Nov 15, 2010 at 9:27 PM
    #2
    dustin81

    dustin81 DUSTOFF

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    would you gain HP
     
  3. Nov 15, 2010 at 9:31 PM
    #3
    BenJammn5

    BenJammn5 [OP] RN

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    doubt I would feel a difference in throttle response, more after the noise.
     
  4. Nov 15, 2010 at 9:34 PM
    #4
    memario1214

    memario1214 Vivid Illumination Vendor

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    You will be louder. You will most likely also not pass smog... I have my rear cats deleted. But I have other things done as well to my system. The rear cats are like an equivalent of a 3" glasspack, if you cared to know that haha
     
  5. Nov 15, 2010 at 9:38 PM
    #5
    BenJammn5

    BenJammn5 [OP] RN

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    Hmmm... I really wonder if I wouldn't pass smog, no sensors in there. Okay, if all fails I'll just delete the muffler(I know I know, 'back pressure man, you'll lose all your torque!')

    3" glass, so they're straight through with perforated padding or something surrounding?
     
  6. Nov 15, 2010 at 9:52 PM
    #6
    memario1214

    memario1214 Vivid Illumination Vendor

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    1. I really don't know what goes into passing smog because I don't have it here in MT. Don't they check your emissions with some sort of sensor? The rear cats burn that extra unburned fuel before it leaves the tailpipe.

    2. Do not just delete your muffler. Your truck will sound like the most pissed off lawn mower ever! I played around a bit when I was redoing my truck and when I cut out the muffler... No good. Put in some kind of muffler one way or another. Also, backpressure anymore doesn't really have any effect on anything. You will lose a little torque, but it is negligible

    3. The rear cats are just sound equivalents of a 3" glasspack roughly. It is essentially just a hollow metal tube with tight metal mesh in it that gets really hot and burns any fuel still in the line. I recall some kind of perforation inside when I cut mine apart, but exactly what it looks like is escaping me.
     
  7. Nov 15, 2010 at 10:09 PM
    #7
    BenJammn5

    BenJammn5 [OP] RN

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    Thanks Colton, I just repped you.

    Agreed on #2, and honestly I wouldn't ditch the muffler, especially since I just bought it. I made the comment on the torque and backpressure cause I think it's over rated and misconstrued by most. The results are negligible no doubt.

    So that's what those secondary cats do, burn the extra fuel. Excellent info, now if anybody in California could chime in on this.
     
  8. Nov 15, 2010 at 10:11 PM
    #8
    memario1214

    memario1214 Vivid Illumination Vendor

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    Yeah sorry on that one man... If I knew what went into smog testing I may be able to help you out.
     
  9. Jun 15, 2013 at 8:21 PM
    #9
    Yota4me

    Yota4me Active Member

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    charocal filter delete/kn intake, rear cat delete. horn mod, 20% tint front windows, bull bar, M1 Full Syn, black plasti dip emblems. Next up aero turbine 2525xl muffler
    Do it
     
  10. Jun 15, 2013 at 8:39 PM
    #10
    Justus

    Justus fucks not given

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    Open it up too much and u will notice the tq down low go bye bye.

    Over rated maybe sometimes........ but under rating it is a slap in the nutz, and wallet if u go overboard n/a
     
    Last edited: Jun 15, 2013
  11. Jun 17, 2013 at 6:47 AM
    #11
    Lurkin

    Lurkin Well-Known Member

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    "smog" depends on where you are at, here it TX it is basically an OBDII connection, no codes = pass. In this case removing the rear cats will still pass. In CA I have "heard" that they also do a visual, in which case you would fail.
     
  12. Jun 17, 2013 at 3:27 PM
    #12
    PMK

    PMK Well-Known Member

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    But are the second set really cats or just resonators? I have wondered this since day one.

    PK
     
  13. Jun 17, 2013 at 3:58 PM
    #13
    Fast_Freddy

    Fast_Freddy Well-Known Member

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    Your car has to have ALL the emission components that came with it(or some CARB approved variation of it), stock. You cannot, however, permanently remove any emission component and still pass smog. Im a smog tech in cali.
     
  14. Jun 22, 2013 at 12:50 AM
    #14
    Dirtysouthmafia23

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    You said you didn't know how they check smog in California. Don't take my word for because I don't live in California but I thinks they put a sniffer in the tailpipe and check how much hydrocarbon (gasoline) nox and carbon monoxide gases are coming out of it. In my opinion I wouldn't do it because I hear California is strict on there emission laws.
     
  15. Jun 22, 2013 at 12:58 AM
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    MGMTacolover55

    MGMTacolover55 Well-Known Member

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    Just put a cat on I mean your cats are mostly dead from taking all those poisonous gases for your truck
     
  16. Mar 5, 2014 at 7:25 PM
    #16
    TACO FOR LIFE

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    i know this thread is old but i hope ill get a reply. if i remove the back 2 cats i will NOT get a check engine light correct?
     
  17. Mar 5, 2014 at 7:25 PM
    #17
    TACO FOR LIFE

    TACO FOR LIFE Well-Known Member

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    also i'm not worried about smog or loss in low end torque
     
  18. Mar 5, 2014 at 7:31 PM
    #18
    joes06tacoma

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    Correct. No check engine light.
     
  19. Mar 5, 2014 at 7:52 PM
    #19
    TACO FOR LIFE

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    ok thanks
     
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