Will removing my Catalytic Converter mess up performance?

Posted by pointblank9957, Aug 15, 2012
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  1. pointblank9957

    pointblank9957 Proven Member

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    I'm thinking of taking my cat off but idk if the ecu will screw with the performance afterwards, will my car's ecu be fine without a cat?
    #1
  2. bryanwheat

    bryanwheat DSM Wiseman

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    What is your reasoning for removing it? Do you have state mandated safety or emission inspections?
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  3. pointblank9957

    pointblank9957 Proven Member

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    Better flow/sound. We have no emissions tests here. Almost everyone has no cat has it hollowed
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  4. DSMReviver

    DSMReviver Proven Member

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    Removing the emission will not hurt the car at all but the environment. Yeah.., i said it. But, you could gain in performance a little from freeing up the back pressure. You could buy an high flow cat and be done with it. If you are still running a stock turbo i would not worry too much with removing the cat or replacing it with the high flow one.
    #4
  5. bryanwheat

    bryanwheat DSM Wiseman

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    If you have a safety inspection than they will still look for a cat on the car. With your non turbo 2.4 you will not notice any gain removing it, perhaps even a slight loss of torque. I would just leave it alone.
    #5
  6. Smeed78

    Smeed78 Probationary Member

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    The ECU would be fine but like the others stated above, it might help or hurt the cars performance.
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  7. guapking

    guapking Proven Member

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    Get a high flow metallic catalytic converter which flows just as much as not have a cat according to the test at importtuner.com. I run a magnaflow spun metallic cat and still pass emissions plus gain the extra flow.
    #7
  8. WES_393

    WES_393 DSM Wiseman

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    Would it hurt anything? No, unless you consider a CEL a problem. And even that can be easily solved. Will it give you any performance gains? Again, no. When it comes to the 4g64, the biggest restriction when it comes to horsepower is the SOHC head. But swapping to a DOHC head would do nothing but kill low end torque (which is where the 4g64 shines) for a very minimal gain in top end power.

    So in a nut-shell, it would be just for sound. Nothing wrong with that, but it would be a very minimal gain compared to a full exhaust system.
    #8
  9. KONEKILLER

    KONEKILLER Probationary Member

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    I would just switch to a high flow cat and call it a day.
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  10. SY1100

    SY1100 Proven Member

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    keep in mind its federal law to have a cat. If you get pulled over and the cop wants to be a PITA he can write you for it...
    #10
  11. UrbanSmoker

    UrbanSmoker Proven Member

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    State patrol do not have federal jurisdiction. They are sworn to uphold STATE laws. i don't know how many feds pull you over:confused:
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  12. SY1100

    SY1100 Proven Member

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    All states are required by feaderal law to have state regulation regarding emisions, it varies state to state but one thing is for certain if the car came with a cat converter from the factory it must always have a cat converter on it..
    #12
  13. pointblank9957

    pointblank9957 Proven Member

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    my 64 doesnt have sh** for torque, it lags a lot, i suspect dirty injectors, just seafoamed it yesterday

    i dont care. i can hollow out the cat and theyd never noticed the difference. up here the cops dont check anything. i mean watch this video and you'll know how lenient they are:

    Lazy cop caught on camera - YouTube

    the cops dont care and we dont have inspections/checks or anything so i dont really care.
    #13
  14. guapking

    guapking Proven Member

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    If you really want to go cat less put on a high flow metallic cat and put a electric cutout on the downpipe before the cat if you ever want to open it you can with the push of a button . This is what i'm doing and it works well. I had this on my 2g n/t a few years back. Now on my 1ga talon tsi.
    #14
  15. crazytsiawd

    crazytsiawd Proven Member

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    Most likely just a CEL, you would gain some performance though.
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  16. UrbanSmoker

    UrbanSmoker Proven Member

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    unless it's "antique":sneaky: 1g guys are already there...
    #16
  17. jtmcinder

    jtmcinder DSM Wiseman

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    Feel free to post a link to either the federal law that forces states to have a cat rule (but don't let the Tea Party see the link, please) or to the Iowa regulation requiring a cat.

    I'll wait.
    #17
  18. ramsack

    ramsack Banned Member

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    Police take an oath to uphold the Constitution. I don't see anything in there establishing an EPA and giving it any jurisdiction to create laws and prosecute people as criminals. States have the right to have their own DEPs, and those laws are actually enforceable.
    #18
  19. AngelOfPassion

    AngelOfPassion Proven Member

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    Lol yeah. There is no way that is a state law. The police have no way of giving you a ticket for that. However they will give you a ticket for your exhaust being too loud even if it isn't. If they notice it is catless that is what they CAN and will do unless it is a nicer officer.

    You can get it thrown out in court though if they don't have a decibel reading... which they won't LOL.
    #19
  20. ramsack

    ramsack Banned Member

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    It only needs to be there if your state requires it to be and you aren't exempt from emissions. It usually never falls under the scope of a safety inspection. A muffler does, though.
    #20
  21. bryanwheat

    bryanwheat DSM Wiseman

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    It sure does fall under a safety inspection here in Missouri. I am sure that there are other states that are the same.
    #21
  22. LiquidX

    LiquidX DSM Wiseman

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    So what was lazy about the Officer in that video? He is sitting at what appears to be a school zone probably because there have been reports of high speeds. Station an Officer to show presence and the violations reduce (hopefully).

    Granted the sedan is going the wrong way. Perhaps the Officer was doing paperwork at the time or realized it was an honest mistake made by the motorist. Spirit of the Law and Letter of the Law, and it's also possible it's a small town with little to no traffic at that time in that area to help establish that it was an honest mistake.

    Until you put yourself in the shoes of an Officer and have taken the Oath and wear the badge, don't criticize an Officer.
    #22
  23. UrbanSmoker

    UrbanSmoker Proven Member

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    He is parked at a stop sign, and laws at least here state you cant park 30 feet infront of a stop sign. :thumb:

    He also didn't pull over the person going the opposite way in a one way street.
    #23
  24. ramsack

    ramsack Banned Member

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    It's funny that everyone in the world is supposed to buy a Prius but cops have historically been given giant boats of cars that are gas guzzlers, and they're allowed to sit there with the thing running with A/C all day.
    #24
  25. bryanwheat

    bryanwheat DSM Wiseman

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    I am sure you are more aware of what laws that police are supposed to follow than the police officer in the video. They are able to do things that the rest of us aren't in order to do their job.
    #25
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