yo Jal should I get a high flow cat or a cat belite well I guess it depends cuz each have their pros and cons a high flow cat is that it’s a more efficient catalytic converter as it does keep elements of a catalytic converter but it just allows the exhaust to flow a little more freely you get performance gains get a better sound out of your exhaust and you don’t really have to worry about a check engine light and smog depending on which state you live in should be a little bit easier to pass with it now capad on the other hand you’re just removing everything there’s nothing it’s a straight pipe it’s going to be the loudest going to see the most performance gains out of it but some people don’t like the noise that comes with it and not to mention it’s more than likely going to throw a check engine light you have to tune out and probably not going to pass smog with it

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  1. It's also a federal crime to do a cat delete unless you're only driving it on a closed course (race track, drag, etc.) You have to put it on a trailer.

  2. Reminder that high flow cats often do not capture toxic carbon emissions like a OEM cat would. They are often scams and will not allow you to pass smog.
    Cat delete is only for tracked racecars, it is not legal to have them on your car.

  3. High flow cat is the answer 97% of the time.

    Catless isn't as fun as you think, it doesn't sound as good as you think it does, and it smells infinitely worse than you imagine.

  4. If you are going the careless route don’t be an idiot and just knock out the center material of a stock catalytic converter, get an actual straight pipe that takes the place of the cat. Hollowed out catalytic converters flow worse than straight pipes due to the turbulence that happens inside the now hollowed out cat. You lose power as compared to having the cat in place and functional and it sounds like ass on top of it.

  5. did a catless downpipe on my gti and swapped to a highflow after 6 months anytime I was stopped the aircon would blow that awful exhaust smell into the car. also I think the high flow sounds a bit better removes some of the tinniness and rasp compared to a cat delete

  6. 1. Don't live in a Commie state with illegal smog mandates
    2. You can delete the cat and still run resonators and mufflers – this guy is a clown acting like a cat delete is an everything delete open header dump.

    Even a straight pipe can be acceptable levels of noise done right

  7. all yall saying the smell is bad with a cat delete are insane, yes it makes the car smell like exhaust but with a proper tune, exhaust smells good, obvi if youre running insanely rich then itll smell like death tho

  8. The cat(s) also keep some pretty gnarly chemicals at bay as well. Like in a "if you're exposed to this for an extended period of time you're going to have cancer" kind of way.

    I ran catless years ago. My laundry room was in my garage. My clothes permanently smelled like the fumes, even long after I sold the car.

    Plus at this point in time the performance gains are negligible between the two. You're freeing up >10whp going catless. People only still do it because it's cheap.

  9. I've got a high flow cat, was convinced by my mechanic to not go catless on my yote mustang because it would stink alot, I kinda wanted to do flames and bs like that but reading the comments maybe I did the right decision not going catless

  10. Personally I went from having three catalytic converters to having one high flow cat and straight pipe the rest, on my v6. Doesn't really smell unless im idling in a place for a long time (even then dont even smell it unless i open the door) it's loud and aggressive. Im adding a resonator now reduce drone and rasp.

  11. I personally have seen name brand high flow cats blow up internally. You dont have to worry about that with a catless. But there's definitely pros and cons to both

  12. I daily drove my catless Mustang for like 2 months and went back to stock it’s not worth the headaches I get each time I drive it..

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