Is a Cat Delete Worth It?

Thanks to Honeygain for sponsoring this video! Head on over to and enter code DONUT & you’ll get your first $5 to your Honeygain account.
For centuries humans have had an unanswered question: ARE TEST PIPES WORTH IT? Well today we’ll teach you how to make your own test pipe and then take it to the Dyno to see exactly how much of a power bump we get it! Let’s do some race car stuff bby.
We have a new channel!
Money Pit is where you get to learn about cars as we work on them. Each ep we’ll breakdown how each component works and then we’ll upgrade it. Join us in our journey to build cool cars, learn about them, and drive the crap out of them!
Some of our best videos ever are coming out soon, stay tuned so you won't miss a thing!
►Subscribe here:
Check out more Donut Media Videos:…
Want a Donut shirt or sticker? Visit
Like us on Facebook: donutmedia/
Click here if you want to learn more about Donut Media:
Donut Media is at the center of digital media for the next generation of automotive and motorsports enthusiasts. We are drivers, drifters, and car enthusiasts who love to tell stories.

Lae alla



  • But how did it SOUND?

    BroclamBroclam25 minutit tagasi
  • Why waste your time with losers investors when you can earn up too $1200 with only $100 minimum investment Ask me how to get started

    Victoria Williams HVictoria Williams HTund tagasi
  • Way more power =7hp! Frankly I would rather have clean air?

    Dick MickDick MickTund tagasi
  • This is a legit learning video

    Mason HallMason Hall2 tundi tagasi

    Frank289100Frank2891003 tundi tagasi
  • took my cat off in my 85 monte carlo 305, and she sounds a little raspy but when I get some mufflers should sounds nice, also switch up to an x pipe soon.

    Robert PetersRobert Peters6 tundi tagasi
  • 14:45

    Josefino MercedJosefino Merced9 tundi tagasi
  • My stupid ass looking at the title confused: "Why and how do you delete a frickin' cat?!"

    yoofer121yoofer12116 tundi tagasi
  • How do you know you're friend's window broke because he didn't disconnect the battery?

    ATF Ace.ATF Ace.Päev tagasi
    • You guys live my dream life

      wnnalis cioovwnnalis cioov4 tundi tagasi
  • I already know how to weld it’s pretty easy now but the only thing is tig is fucking hard but once you get the hang of it it’s easy also I’m surprised you don’t have a tan 😂😂😂😂😂 with that shirt what your secret

    Dar WinDar WinPäev tagasi
    • Would love to see the same thing but with a NA engine!!

      wnnalis cioovwnnalis cioov4 tundi tagasi
  • Your mig gun cable should be kept as straight as possible to prevent bird nest. And you didn’t wear a jacket which is not good as mig welding produces several different lights, infrared, ultraviolet, and there’s another I can’t think of and it produces radiation, not wearing proper ppe is rather reckless.

    Andy GoddenAndy GoddenPäev tagasi
  • Just put your cat back in before you need an emissions test 😂

    TheSaxAppealTheSaxAppealPäev tagasi
    • Next on EPA's list for huge fine for stupidly removing his cat.

      miko foinmiko foin22 tundi tagasi
  • I want to delete my wife's cat. Not the catalytic converter in her car. I mean her pet.

    MarvMarvPäev tagasi
    • Nice eye protection, should stress how important.

      miko foinmiko foin22 tundi tagasi
  • Why not a new high flow converter

    Mark McclendonMark McclendonPäev tagasi
  • 5:38 the “machin” xd

    Benja Mtz SBenja Mtz SPäev tagasi
  • I LOVE cardboard and sharpie note pad. Am I the only one?

    Nicholas ThompsonNicholas ThompsonPäev tagasi
  • lol, Rhodium or ROADium!

    PunkinhedPunkinhedPäev tagasi
  • It's always worth it, power, sound, crackle, all you need is a simulator to get around it

    frank wfrank wPäev tagasi
  • You’re in LB area which equals illegal, not worth it in my book. Plus think of the environment....just saying

    Peter HorvathPeter Horvath2 päeva tagasi
  • Okay so I’m sorry to do this but it’s not a torch it’s a freaking whip know your facts

    Cody GroatCody Groat2 päeva tagasi
  • The biggest benefit of a cat delete is the reduced risk of it clogging and overheating the exhaust and cylinder with backed up heat

    joshdrobny93joshdrobny932 päeva tagasi
  • Paul rudd look alike

    rr2 päeva tagasi
  • Would love to see the same thing but with a NA engine!!

    Outlaws driftersOutlaws drifters2 päeva tagasi
  • You guys live my dream life

    Anthony ArroyoAnthony Arroyo2 päeva tagasi
  • I can just imagine the EPA knocking on your door after you made this video

    wnnalis cioovwnnalis cioov2 päeva tagasi
  • Nice eye protection, should stress how important.

    Deadsy PadillaDeadsy Padilla2 päeva tagasi
  • Next on EPA's list for huge fine for stupidly removing his cat.

    alan connellyalan connelly2 päeva tagasi
  • How old was the “stock”cat? Need a new cat to compare if it was used as old cats do have hairballs

    Life Saving DefenseLife Saving Defense2 päeva tagasi
  • Skip to14:40 if you can weld and are interested only in the results

    67672 päeva tagasi
    • I need a miata!!!

      wnnalis cioovwnnalis cioov2 päeva tagasi

    Anthony BrownAnthony Brown2 päeva tagasi
  • Zachary, please come home. We’re worried about you ever since you left with that “car from Japan” you kept going on about. Your mother and I miss you very much. Love, dad. P.S. Please do a video on high torque starters and if its worth it. The old Camry doesn’t turn over like it used to.

    Romano NaidooRomano Naidoo2 päeva tagasi
  • That’s a ton of hp on a Miata

    goalmaker88goalmaker882 päeva tagasi
  • Came her for a cat delete, got a math lesson and a bandsaw plus welding tutorial. ☝

    ice45kice45k2 päeva tagasi
  • Miata LSD next!

    Syazzy SlacksterSyazzy Slackster2 päeva tagasi
  • Breaks down every aspect of welding and proceeds to weld with no gloves. Awesome

    Branden WaltzBranden Waltz2 päeva tagasi
  • Loud

    Squibly StudiosSquibly Studios2 päeva tagasi
  • Cancer exists so wear long sleeves when ur welding.

    Rob AlthuizenRob Althuizen2 päeva tagasi
  • Body kits in Miata

    Kian CastilloKian Castillo2 päeva tagasi
  • Good to see I'm not the anyone that uses pieces of cardboard and a marker.

    Dimitrios FDimitrios F2 päeva tagasi
  • It's just not worth deleting the cat in my opinion. Crazy why so many people do that on their daily driver.

    baloo21baloo212 päeva tagasi
  • Ah, the good old test pipe. Something I've done on nearly every Honda I've ever owned, much to my neighbor's dismay. I eventually got smart and just did header back exhausts but before I had money, cat deletes with a ghetto ass test pipe rigged in it's place was the ticket baby. Who cares if it made more power, it sounded like it did and that's all that mattered to 19yr old me.

    RetroCNYRetroCNY2 päeva tagasi
  • How the hell do leave hands bare in the beginning!,

    Leonard KraussLeonard Krauss3 päeva tagasi
  • I need a miata!!!

    B GrB Gr3 päeva tagasi
  • Musics please n grace yawl

    mistamontiel00mistamontiel003 päeva tagasi
    • graceth***

      mistamontiel00mistamontiel003 päeva tagasi
  • Anyone else just think to themselves “Damn, his hair is fantastic” ?

    miko foinmiko foin3 päeva tagasi
  • If you add a blow-off valve, you can blow off the excess pressure on the intake side. Cheaper than a new turbo.

    Eric ErnstEric Ernst3 päeva tagasi
  • 0:36 "we got a welding machine."

    Eric ErnstEric Ernst3 päeva tagasi
  • 13:22 --this explanation has rap meme written all over it. All the moves are moved.

    Oscar TheGrouchOscar TheGrouch3 päeva tagasi
  • Grind the wastegate hole. This was always a common mod for Mitsubishi turbos with internal wastegates. The flapper is plenty big enough to cover a larger hole, but the wastegate hole itself wasn't big enough to bypass enough exhaust gas, hence it goes through the turbine itself, increasing your boost. Shouldn't take more than a couple hours or so to pull the turbine housing off and grind that sucker. I saw you were making about 235 and I guessed you'd make at least 250 with the cat bypass. Cat bypasses are no joke. If you're trying to make power at the track, a cat bypass is a no-brainer. PS- I love all of Zach's content. He's great, and he's taught me a lot. Dude knows what the hell he's doing!

    Adam BaldwinAdam Baldwin3 päeva tagasi
    • You need a 2 post! Hate to see people with your level of talent still, roughing it, on the concrete!!! Lol

      miko foinmiko foin3 päeva tagasi
  • Cool vid!!! It’s hard to make an apples to apples comparison, Jew to mapping, but really, higher exhaust flow when tuned in gonna make more power. Love the Chanel 👌🏻👊🏻

    francis canavanfrancis canavan3 päeva tagasi
  • I have a catted bbk xpipe on my mustang and I’m constantly messing with the tune and upstream 02 sensors. Regardless what you run I see a lot of young kids pulling cats off their cars and the fuel trims are off the wall getting 3mpg and running like dog poo pop

    Thunder ConThunder Con3 päeva tagasi
  • It’s still a Miata at the end of the day is 4 horsepower worth it? leave your cats on for emissions and smells.

    garrett johnsongarrett johnson3 päeva tagasi
  • For 5 hp just keep the cat, be legal don't pollute that much and be cool at your inspection ...

    Prignon YvesPrignon Yves3 päeva tagasi
  • If I wanted to see ads, I wouldn't be paying for youtube premium.

    M GM G3 päeva tagasi
  • 7:40 classic , no matter you have equipment we do it the way we like it

    auto mechauto mech3 päeva tagasi
  • Add a few drops of oil or wd40 while it cuts. It will help it cut, reduce heat and save you on blades.

    Evan BirminghamEvan Birmingham3 päeva tagasi
  • I wonder what this experiments results would be in a N/A engine like an LS or a BMW S62?

    Daryl JosephDaryl Joseph3 päeva tagasi
  • I bloody hate advertisements

    AD L200AD L2003 päeva tagasi
  • Y que pasa si le montas un catalistico mucho más grande ..

    Jomar CorderoJomar Cordero3 päeva tagasi
  • Not that I would ever do this myself ***cough*cough*** but I have "heard" you can remove the cat, beat all the innards out, then put it back on the car. If the cat goes bad, that may help a few people that do not have the $800 replacement cost (for my car).

    Chris BrownChris Brown3 päeva tagasi
  • Zach: takes catalytic converter off EPA: *angry non-car people noises*

    DaBigKahunaDaBigKahuna3 päeva tagasi
  • Great test. I think you need a bigger Boost set up so that we can see the real difference. Or maybe just go naturally aspirated. I'm pretty sure though if you have a exhaust manifold catalytic converter a header works better.

    Jeremy UtleyJeremy Utley3 päeva tagasi
  • You need a 2 post! Hate to see people with your level of talent still, roughing it, on the concrete!!! Lol

    Artie JohnsonArtie Johnson3 päeva tagasi
  • 5:34 MACHÍN MACHÍN!!!

    De La CalleDe La Calle3 päeva tagasi
  • So when your neighbor's kid dies from an asthma attack at least you have a 1.5% power increase to take the edge of your guilt. Hell, he may have died anyway.

    David BesantDavid Besant3 päeva tagasi
  • Anyone else just think to themselves “Damn, his hair is fantastic” ?

    alida flusalida flus3 päeva tagasi
  • Hot Rod Magazine did a similar test several years ago at West Tech Dyno and conclude very little difference between Cat and No-Cat. The length of the pipe from the engine to the back of the car was way more of a factor, along with mufflers.

    Snow CrestSnow Crest3 päeva tagasi
  • Oh so the cat in my camaro isn't just supposed to a straight shot through? Interesting...

    ethan hubbardethan hubbard3 päeva tagasi
  • Welding without gloves not a good idea lol

    Brandon TroyerBrandon Troyer3 päeva tagasi
    • 5:08 When the character in the movie says the name of the movie in a normal sentence 🙆🏾‍♂️

      alida flusalida flus3 päeva tagasi
  • At this point why have an exhaust

    Grass Board NerdsGrass Board Nerds3 päeva tagasi
  • its not worth removing it for extra 2% power ... i thought it would be more lol

    MUHAMMED KHMUHAMMED KH3 päeva tagasi
  • While he was trying to explain how to use the smelter thing i was sitting here thinking of a potato with wires connected to a clock.

    leonardo cruzleonardo cruz4 päeva tagasi
  • 🧑‍🦯🧑‍🦯 the camera guy after looking at the flashes

    BreakDownOfAUDY _.BreakDownOfAUDY _.4 päeva tagasi
  • 6:00 what happened to your thumb?

    Doin RocksDoin Rocks4 päeva tagasi
  • Remember that bigger turbos that have more lag are going to like a test pipe better because they will support faster also once you make power good luck keeping a catalytic converter they melt like a bitch

    Utah county Picazo's pageUtah county Picazo's page4 päeva tagasi
  • Should have used stainless and tig

    Reggi_The_KoalaReggi_The_Koala4 päeva tagasi
  • What is the suggested start time of the video to skip the bull.

    Judge LoveJudge Love4 päeva tagasi
  • Sure beats the hp you get with bad cats. Remember to replace catalytic converters at 150k to 200k miles or if you're vehicle ever puts oil or coolant out of the tail pipe. A blown ring or head gasket sucks, but it sucks worse when you have to turn around and do a second rebuild because a bad catalytic converter toasted the engine.

    Easy CheeseEasy Cheese4 päeva tagasi
  • my eyes hurt.

    Gickels McDoogleGickels McDoogle4 päeva tagasi
  • Then why not just run two...??...cause it's a global warming scam .....just for politicians, and capitalism to make mandatory money....aaack, aaack....and how come they haven't made converters for those cow farts that californication is raging about...😳😝....whaaat.?!?...shattered his rear window..?!? welding .?!?......and ya got to weld inside the flange too....uh huh....and you still have to tune when making mods...otherwise yer creating worse tunes....

    59vaughn59vaughn4 päeva tagasi
  • Made way more power ? Increase was @2.5%

    Randy TremaineRandy Tremaine4 päeva tagasi
  • Cutting one off tomorrow because it's clogging

    Hirsch nopeHirsch nope4 päeva tagasi
  • 5:08 When the character in the movie says the name of the movie in a normal sentence 🙆🏾‍♂️

    Erik LonaErik Lona4 päeva tagasi
  • 5:08 When the character in the movie says the name of the movie in a normal sentence 🙆🏾‍♂️

    Erik LonaErik Lona4 päeva tagasi
  • Get a Nissan leaf electric motor - gear that Son of a Bish 1 to 1 - and hook it up to power a turbo and get some injectors that are 20 times bigger - then Bob's your Auntie.

    AEONAEON4 päeva tagasi
  • The opposite boat independently close because laura statistically walk as a tan goose. cultured, deserted train

    Brian SegoviaBrian Segovia4 päeva tagasi
  • Honeycomb....I saw squares

    Michael NelsonMichael Nelson4 päeva tagasi
  • That is one fast Miata, almost forgot how fast it is over stock even though I watched the whole build.

    Octane StreetOctane Street4 päeva tagasi
  • Sure its worth it if you don't want to pass emissions

    Onyo6Onyo64 päeva tagasi
  • 😎🇺🇸

    Peter SchmidtPeter Schmidt4 päeva tagasi
  • What happens to the Oxygen Sensor if I straight pipe 🤔

    Francisco J Borke SrFrancisco J Borke Sr4 päeva tagasi
  • a cat delete is worth it if you dont mind giving any one standing behind the car cancer and other health issues from Carbon Monoxide

    kevin overholtzerkevin overholtzer4 päeva tagasi
  • I am rather the dog human anyway, delete all cats xD

    Pepe SchnürschuhPepe Schnürschuh4 päeva tagasi
  • Wear welding gloves and sleeves kids.

    Scott MalcolmsonScott Malcolmson4 päeva tagasi
  • - cats keep the exhaust sounding good and not raspy too!

    thor294thor2944 päeva tagasi
  • How does is sound?

    Ali NAli N4 päeva tagasi
  • So they got 5 more hp

    G. Leet GG. Leet G4 päeva tagasi
  • Donut is creating the Need for Speed in real life, and Zach is the expert mechanic that upgrades your car

    Tobias PetersenTobias Petersen4 päeva tagasi
    • Oh my god a donut video game would be so coool, partner with forza and make jobe the mechanic in the next game

      Grass Board NerdsGrass Board Nerds3 päeva tagasi
  • this is the fbi . no.

    Nutmeg DonkeyNutmeg Donkey4 päeva tagasi