Why it’s Illegal to Remove the Catalytic Converter in Your Car
Why it’s Illegal to Remove the Catalytic Converter in Your Car

rev up your engines, Adrian says what do you think about removing the catalytic converter in order to
boost the power of a turbocharged engine is it harmful to the engine, well realize
that it’s against law to remove a catalytic converter in United States you’re breaking
federal law, but I mean I talked to guys they live in Montana where they don’t
have any kind of inspection and they do it, and the only thing that a catalytic
converter does, is it slows down pollution, it burns
unburned hydrocarbons if you remove it from a modern-day car, all the kinds of
lights and stuff will come on, but it’ isn’t gonna hurt the car will actually run better,
cuz it’ll breathe better but it will pollute more, you’re braking the law, but the
only thing or reason a car has a catalytic converter is to burn hydrocarbons, if you
remove it of course you remove that and then it will just go through the exhaust
and there’s less back pressure and when you set them up right they of course
will run better, you know race cars don’t have catalytic converters on them, cold
wild says Scotty my car has a check engine light when I turn the key to
accessory, when I start the engine it goes away, what could it be should I be
concerned Thanks, okay no cars are made that way, here’s how it works, if you have
a normal car and you turn your car to the accessory and don’t start it, the
check engine light is supposed to stay on that shows you that the bulb still
works then when you start the car the computer does a bunch of tests, if it
finds a problem that’ll turn the light on and leave it on, if it doesn’t, the
light stays off that’s totally normal almost all cars sold in the United
States are set up that way, as I tell people when they’re looking for a used
car, if you’re looking at a used car good idea to have a scan too, like I
showed you get twenty four dollars scan tool easy cheap enough stuff, but if
you don’t have a scan tool you turn the key to the accessory and a check engine
light doesn’t come on, odds are they took the bulb out and then you definitely
would want to scan it cuz even if they took the bulb out, the scan tool would
still read a problem if there are any stored inside the computer, Eto says scotty
just bought a used 2008 mazda cx9 what do you think about this SUV, well I would
have never bought it, I had a customer that just bought one of those and
then they brought it to me a week after they bought it, was running like crap and
I said you’re gonna have to rebuild your engine it’s got a problem it’s gonna be
anywhere from twenty five to forty five hundred dollars I am NOT a fan of those
things, but you’ve already bought it, so change your oil a lot,
and on that baby I’d change it every four five thousand miles religiously, because
they do have engine problems as they age, if you don’t have any engine problem and you change
the oil every four or five thousand miles, hey it might be a decent car you
never know, but I’ve had customers have very bad experience buying those things
secondhand there’s a lot of them where there VVT valve system will break down a
lot and then it cost thousands to repair them as they do break down, so if it does
run good now yeah I haven’t any problems change the oil all the time, edward says
Scotty what do you think of a 2005 pontiac grand prix GXP was two hundred
two thousand miles, and a new tranny for six grand
although it does need spark plug wires and a new ABS passenger side wire, thoughts okay
well if it really has a new transmission I would want the
paperwork and I would call the place that supposedly did the work to see it
was really done and six thousand dollars more than I’d pay for a 14-year old
Pontiac but if you like it and it runs good and that transmission really was a new
one put in or remanufactured one installed in it, ahhh have some fun driving
around, just don’t drag around in it because you’ll burn that transmission
out too, the problem of that vehicle is the engine is stronger than the
transmission, if you want to drive it normal and use it as a toy car nothing
wrong with that, but don’t think you can drive that car as an everyday driver and
put thirty thousand miles a year on it cuz it will fall apart in front of your
eyes if you do that Armando Lopez says Scotty I’m 17 I’m
getting a 2009 or 2010 g37 Infiniti coupe do you think it’s reliable, I’m
getting from car max do you know about those cars, okay you’re 17 you’re getting
a g37 Infiniti coupe you’re gonna pay up the wazoo for insurance cuz that’s a
sports car, the problem with those cars are they’re good cars, they’re well make
cars but as they age they’re expensive to repair, Nissan Quality has gone down
since the company Renault the French company bought them out and merged with them
years ago, the quality isn’t what it used to be the problem with the g37 is, it’s a
high-tech car they break when they break the parts cost a fortune,
I’ll give you an example, I had a customer with one, the power steering hose went out, the
only people that could get it was the dealer and it was like 350 bucks for
hose assembly, where for say a Toyota I could get an aftermarket one for 50 bucks an autozone that works fine but I couldn’t get it for the infiniti,
so realize that, I wouldn’t go that high-end if I were you and seventeen and
getting the car, unless you have a rich father who’s gonna pay for everything, then
go right ahead, Melod says is a Hyundai
2013 with 126 thousand miles a good car to buy are there problems with their engines too,
here’s the thing Hyundai and Kia they’re kind of a merged
company, Hyundai I bought 33.8% of Kia in 2013, so they’re kind of like a merged
company and they ended up recalling 1.2 million of their 2.0 and 2.4 liter
engines if that car has one of those engines don’t buy it, but if it has a
different engine they can be a decent vehicle, don’t pay too much for a used Hyundai the Korean car the resale values are kind of low, so if you can get it cheap
enough it could be a decent car, so if you never want to miss another one of my
new car repair videos, remember to ring that Bell!

100 thoughts on “Why it’s Illegal to Remove the Catalytic Converter in Your Car”

  1. Scotty Kilmer says:

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    This was an excerpt from one of my Live Car Talk shows where I answer your car questions Live. If you enjoyed it, every Thursday at 1 pm CST and Saturday 10 am CST I live stream and answer your questions!

  2. Kelly Penrod says:

    We take the grassfire starters
    (crapilytic) converters off our trucks to keep from setting hay and pasture land ablaze, screw the greenwienies and the law.

  3. Strikehold PIR says:

    Nissans in my experience are bulletproof! I have owned 5 maximas and 2 altimas and now a Murano with 125K and Infiniti G35s with 160k! They work! They dont breakdown…with other than normal stuff, brakes tires and rotors! My son bought a 1985 nissan maxima with 425000 miles and drove the heck out of it!!! My 2 altimas had close to 200,000 miles until i hit deer or sold them!

  4. minuteman2012 says:

    Saw a guy take the cat off…hammered a pipe through the core and knock the element out…and reinstall it….

  5. h h says:

    I remember the old cars with the LED lights on the ECM, it would blink a certain way to tell you what code it blinking LOL. those were fun days trying to figure out the blinks 😀

  6. Mooshy says:

    Maserati Levante with V6 lol

  7. iTzBliTzy v3 says:

    😂 my friendly moter passes mine without an cat.

  8. Clorox Bleach says:

    I can't account for the law's in every state, but I know here in Connecticut vehicles need to go through emissions until the vehicle turns 25 years old. At that point it becomes emissions exempt. But here in the rust belt it's rare to see a vehicle that old that hasn't been restored, of course only the vehicles worth restoring go through that process.

  9. Mar Blox says:

    My C5 Corvette had Seat Belt light always on, Air Bag light always on. ABS and Traction Control lights always on.
    I fixed all these problems by removing the cluster and taking out the bulbs.!!!
    Now it is fun to drive the car again.!!!

  10. WeJoe00 says:

    If your car is older than 25 years old you can go open header/downpipe. 25 year old cars don't have emissions testing. At least, that's how it is in Texas.

  11. Ahmed Diagne says:

    Ok n the thumbnail you can tell he doesn’t know where the catalyctic Converter is

  12. Average Boi says:

    That’s because governments don’t get us

  13. Venir Lekha says:

    Thumbnail was actually a muffler delete lol

  14. Glenn thug life quagmire says:

    Scotty makes videos for people that shop at harbor freight. And drink light beer.

  15. Steve Dunch says:

    Yun Die

  16. taxid3rmy says:

    Scotty, the kindaguy to expose shoddy auto' manufacturer and mechanic practises, and not give a s**t while doing it.

  17. Christofer Williams says:

    Hey Scotty car dashboard vibrates loudly when I accelerate. What’s the deal?

  18. kyle sessing says:

    The first time i removed a cat conv from a car was on 93 Fleetwood Brougham. Not really a caddy guy but it was cheap and reliable at the time. Anyway, i knew it was clogged up. Hacksawed it out. Lived down in MS at the time. Found a shop that welded a piece of pipe in. Ran so much better without it. Had the 350 in it. It was a 93 model.


    What do you think about 2000 Tahoe last 5.3 vortex 154 any changed oil religiously and wondering any maintenance ideas

  20. Javier Hernandez says:

    The only reason why I don't like catalytic converters is because the modern motor oils have no zinc in anymore which is great for engines but poisons the catalytic converter.

  21. The Mad Gentleman says:

    Wait… it is?

  22. LarryC213 says:

    I would have thought that someone who brings their cars to you would have watched your video/s on that Mazda.

  23. Joe Reynolds says:

    Love your channel bro, very informative, keep up the good work 👍

  24. Andy47357 says:

    its not illegal in GA

  25. tvcjr22 says:

    So the H is silent in the name Hyundai 🤔

  26. jeremiah roux says:

    How do you feel about 1999 Ford F-250 with 5.4 automatic transmission

  27. highland fortress says:

    Actually florida doesnt require them

  28. behexen250 says:

    You're confusing the Mazda CX-9 with the CX-7. The 7 is the one VVT actuator and timing chain that goes bad. The 9 has a much better motor.

  29. xshanghu says:

    Don't break the law.

  30. Anon Ymus says:

    Some older engines actually need the backpressure of the cat to allow the o2 sensor to read properly.

  31. ghostsskull45 says:

    Not in Alabama, we don’t have to pass emission standards

  32. Jibrin Idum says:

    I try my best not too miss yr video

  33. xshanghu says:

    Good info.

  34. Conrad Ladouceur says:

    Thumbnail shows a missing muffler, not catalytic converter. Makes it even harder to to you seriously.

  35. RetroGamingGenesis says:

    How much does the MPG improve by and do they cell placebo filters?

  36. Nick Hines says:

    It' s totally legal in Arkansas, it's a filter that suffocates your engine from breathing, laquer thinner will deteriorate my old hoses, I have a 2000 Acura TL, and got 14k in maintenance, I will remove it, before I use laquer thinner, all I know it's bad, and a new one for that car will cost a fortune

  37. Latoshia Ceaser says:

    Will the converter stop the car from starting?

  38. Wes Wells says:

    Hey Scotty ur the best!! My question drive a cammed 5th gen camaro as a daily is this a good idea

  39. Michael Arevalo says:

    Scotty what’s you thought’s on a manual 2006 Lexus IS 250

  40. john lee says:

    Can abs pump module be repair ?

  41. LispyJared says:

    Man Scotty sure does say Hyundai weird. I always say hun-day

  42. Nick Hines says:

    I live in Arkansas, and lots of people remove theirs, my is bad, 2000 Acura TL, it will breath better, must bypass the O2 sensors , but the ehaust is rusting out, got 14k in maintenance, so for 140.00 will do it, that thing has 2 cats and 3 mufflers. But in Arkansas it's 100% legal, no inspection required here

  43. Alex Cordova says:

    What do you think about my G35 2006 coupe drives smooth has a 100,000 miles should I change the transmission oil ???

  44. Steve Johnson says:

    But mine was stolen.

  45. Harley's, God, Guns And Rednecks says:

    Pollutes the air that's what they say but what doesn't? The damn govt will say anything? It's pretty funny big hole in the ozone but damn the world just keeps spinning! Doesn't have anything to do with cat converters or sensors or emissions or any other bull crap the government wants you to believe! It's plain bullshit! But that's me! Yes there's hydrocarbons that cars burn off but as far as destroying the environment and whatever is crap!

  46. davekintz says:

    I've found the Hyundai 1.6 to be a reliable engine. Just keep that timing belt changed. Experience.

  47. Justin Martinez says:

    My car does have one lol

  48. mike larochelle says:

    usa…where it's illegal to modify your car but can change your gender

  49. Dave Robinson says:

    I like u .u know about cars .u always explain what u saying good

  50. Joesep Spindle says:

    I took a cat that was sitting around that my neighbor cut off his car. I bashed all the insides out of it. I then took material off each end until I could shove a 2.5 inch straight pipe threw it and welded around each end. I sanded it down and painted it silver. It is basically a straight pipe that looks like a cat. I still have it in my basement and I never used it. In my state, if the vehicle is 15 years old it does not need to have an emissions test, but if the vehicle was manufactured with a cat on it then it better dam well have one on it when you get it inspected even if they don't have to do the test. I am ready for when a cat goes bad and needs replacing, but they pretty much last the life of the car so the one in my basement is just collecting dust.

  51. Leigh Rich says:

    Be careful of the Federal Catalytic Converter Inspectors…years in prison. I showed a DVD at church and went to federal prison for 20 years.

  52. Jiyu Shugi says:

    I'm only sorry when I get caught.

  53. Larry Conner says:

    The check engine light on my 04 Ram 1500 has been on for 8 years. Found out that when I put gas in it and loosen the gas cap the vacumn is broken and the light comes on. There's even a warning on the gas cap that this will happen. I've put 70,000 miles on this truck and never had a problem. It's the 4.7 engine and it runs like a Singer sewing machine! Doesn't use oil and doesn't miss! The truck has 256,000 miles and I would not sell it! Drive it anywhere!

  54. Marcus Arroyo says:

    what do you think about the 1999 gs300 2jzge vvt-i?

  55. DrSysop says:

    older cars you not need it.

  56. Cal Ripson says:

    other things that are illegal:

    1. Marijuana for any purpose including medical on all 50 states under federal law
    2. Any CB radio with greater than 4 watts transmission power (ask any trucker)
    3. Filing false police reports (ask Mr. Smollett)
    4. Exceeding the speed limit on any highway
    5. Pretty much anything the government has done revealed by Julian Assange

  57. The Spanish Bull says:

    Well even marihuana was illegal few years ago now are legalized in some states.

  58. Deplorable Covfefe says:

    I took the converter off a 86 l6 f150 and it ran great but became a gas hog. Turned it into strictly a work truck.

  59. BowTieForLife _99 says:

    I cut them off my Silverado last week. I could give two shits about exhaust laws

  60. plainlogic says:

    We need to get a complete list of dependable cars and common problems associated with specific vehicles according to scotty.

    He's a valuable resource for used car buyers. And his knowledge should be documented.

  61. Murder Maro1 says:

    As long as you get a good tune after removing your cats on cars with forced induction your car will run fine if not, better.

  62. Juan Morales says:

    i dont have a code for convert catalytic but i do have the code for sensor 1 bank 1 do you think i have to replace the catalytic ???

  63. Captain Licorice says:

    I'm not paying $750 for a fucking metal box. I beat all the internals out of mine when one went bad. No emissions where I live, just put a pipe though it and welded it back up. No one knows the difference

  64. Veiled Heat says:

    It SHOULD never be illegal to do with your own property what you want to do with it.

  65. dan sanchez says:

    Buy a sixties car and rebuild.

  66. Old Time Farm Boy says:

    If the catalytic converter starts plugging up, you can take it off, get a hole saw close to the diameter of the inlet or outlet and a drill extension, drill out a passage between the inlet and outlet, then put it back on. Unless they take it off and look inside, the revenue collectors or auto inspector will never know the difference.

  67. David Petri says:

    Yes removing the cat is better. Some cars will not run right without them (O2 sensors). Just by a high flow cat designed for you application and you good!

  68. pkasb90 says:

    Well quality dropped after Renault bought them. That explains it.

  69. Mike George says:

    Do other countries use the Catalytic Converter to fight auto pollution?

  70. Zack TheBongRipper says:

    Modern engines are so efficient that they are cleaner than the catalytic converter. Just another government waste mandate.

  71. tice sine says:

    How about in canada

  72. MiyukiSadako says:

    Screw al gore and his bs

  73. Eric Talaska says:

    What about disabling EGR?

  74. Sanjeel Dutt says:

    I have a 04 330i e46 with 111910 miles on it n it runs great but the one code is it says it mixtures is to rich or lean n I looked at my plugs n there are fine what could it be

  75. michael mcawesome says:

    Hi Scotty my name is Michael. I recently bought a 2002 v8 explorer. Its got the 4.6 in it and I believe that the engine is missing while it is idling. What do you think of these explorers and what I can do to solve the problem ? Thanks for your help and time.

  76. YOUTUBE watcher says:

    I have a sonata 2.4 nevered had an issue unless It breaks down.

  77. Jeff Mayo says:

    Cats lower CO ,HC ,NOx…..
    Removing cats can decrease performance,as the vehicle is facory tuned for it.

  78. doctorkennydelicious says:

    I have a hyundai with 239,000 miles. I have repaired almost nothing on it. It has been WAY more reliable than my previous Toyota.

  79. Shayne Dumas says:


  80. Mohamed Alie Barrie says:

    I honestly like ur reviews. I'm in Sierra Leone West Arfica. I just bought a nissan pathfinder 2003 nodel that has run 134,000 km. I emits smoke even after changing the oil and plugs. What can u sugges mr sir?

  81. George Spindler says:

    I removed the cat from my 1997 Ford Taurus. It was meowing something terrible. Had to remove the alternator to get her out. Cat was happy and so was the car.

  82. Faig Masimov says:

    When Im listening to this man , I set the playback speed to 0.75 always.

  83. Ali Roberts says:

    in my small country town in the states it is legal to take them out but they're required in the city(our car also got its fuel pump replaced along with a 4 in 1 catalytic converter removed)

  84. Brian Jones says:

    Its not illegal in the state of Montana since we do not meet the standards for emission controls

  85. Joshua Herring says:

    Scotty what do u think of 2007 ford crown Victoria

  86. Mr3gramSpliff says:

    I know u would probably not see this but im 17 and bought my second car its a toyota Camry Solara any thoughts? It has 180,000 miles and apparently a bad catalytic converter

  87. Osvaldo Robles says:

    Does he have a podcast?

  88. Ivan J California says:

    Not against federal law, you have the right to travel within the US. It’s against the vehicle codes in all 50 states though, for commerce.

  89. Jeff Fletcher says:

    I bought my first truck yesterday a 2000 s10 Xtreme stepside and someone hotrodded it and cut off the cats

  90. Eric Maza says:

    Scotty is my car guardian angel.

  91. Psalms of The Heart Ministries says:

    Scotty. Why should Uncle Sam worry about emissions when they are trying to kill us off anyway….

  92. Zach Ehlen says:

    I bought a 05 dodge magnum with a 5.7 hemi about a year ago with 98k miles on it. What's your take on the reliability and life span?

  93. David Gruen says:

    My car with catalytic converter only has 1/4 of psi of back pressure, is it a bit too little or my gauge was faulty?

  94. California Kid says:

    Save the earth!!!! Put you’re cats back on.

  95. Anonymous User says:

    I had this issue that would cause my check engine light come on, and after removing and reinstalling the dash and remedying numerous issues, the check engine light stopped coming on! It'd taken me months of weekend work, but I finally got it! I drove right to the DMV to get the thing tested.

    Nope. The stupid check engine bulb had died. So. Defeating.

  96. Bar Bank says:

    Hey Scotty so on my 2014 Dodge Charger v8 old highway car…So when my eco mode pops up my engine light doesn't pop up but when ecomode doesn't pop up my engine light comes on any way I can fix this problem? Car still drives perfect!!

  97. Alex Vincent says:

    Scotty , do a video of legal and illegal exhaust setups , like h pipes and x pipes and straight pipes and what not , us younger generation need to know these things , I was about to run straight pipes on my 04 tahoe , each pipe will have a catalytic converter yes , but I was gonna break the factory y pipe and have each set of pipes in a flowmaster 10 series , I called a couple places and only 1 of the 6 told me about this and I was literally about to get it done the next day haha I do live in California

  98. Sunrayman123 says:

    Scotty, You are a Master of Ceremonies! I love the flashes of artwork alongside your preachments! This is about one of nearly twenty videoas I've seen of you. I really enjoy your daily entertainment and information! Keep up the great work! DING DING!

  99. thghho says:

    Sir, will removing CAT, increases or decreases fuel average?

  100. The Birds My Word says:

    Second question stupid people ask stupid questions.

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