Downside to going catless? - Mustang Evolution

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Old 10-30-2015, 02:17 PM   #1
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Downside to going catless?

Is there any kind of negative effect on the car if I go offroad x or h pipe? I have bama so I will be getting a new tune if I do decide to go catless. I got the roush axebacks and I want more of a growl from them. Also, does it matter what brand I get? besides the fitment being different. Last question, is the smell noticeable from going catless?
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Old 10-30-2015, 02:40 PM   #2
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Emissions
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Old 10-30-2015, 02:43 PM   #3
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You do smell it when windows down I think but I have muffler deletes as well. I went to LT headers which I definitely smell more than the Off road H pipe. check you state also. Some are a real pain about emissions laws. Florida doesnt care at all lol
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Old 10-30-2015, 02:43 PM   #4
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the stink is terrible, I run quality Sunoco 93 at all times and it still reeks, I tried catless for about a week, the smell reminded me of an old 80's pickup truck, I ended up going with long tubes and high flow cats, hell it still stinks, but not as bad
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Old 10-30-2015, 02:46 PM   #5
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Well in my state emissions is a big deal, there real picky about it but I dont really care, I can always swap the cats back in when im getting smogged. If the smell is as bad as you guys say then its pushing me towards not going offroad.
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Old 10-30-2015, 02:55 PM   #6
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There is a bit of a smell, but it is not bad by my standards (that said, my standards may not coincide with yours).
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Old 10-30-2015, 02:57 PM   #7
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Well from what I have been hearing, if you don't get a tune, it will run rich and smell worse. But since I will have a tune it won't be as bad. Is that correct?
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Old 10-30-2015, 03:03 PM   #8
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Con- anytime you get pulled over and an officer is having a bad day he can write you quite the ticket for emissions tampering.

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Old 10-30-2015, 03:55 PM   #9
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Well from what I have been hearing, if you don't get a tune, it will run rich and smell worse. But since I will have a tune it won't be as bad. Is that correct?
It will still smell bad and will be noticeable.
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Old 10-30-2015, 07:28 PM   #10
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The real question, is the power gain worth the smell?
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Old 10-30-2015, 08:22 PM   #11
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The only time I notice a smell is with the car running in the garage. Not sure why everyone is going around sniffing their exhaust.

As far as police, if they can climb under any of my cars and prove it they'll be fixed in less than an hour.

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Old 10-30-2015, 08:55 PM   #12
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The no cat smell is good, I dunno wtf you guys are talking about.

Downsides are:

1 - Smell if you have a delicate nose
2 - Noise if you are in a neighborhood or an area where cops will pull you over for being too loud
3 - Its illegal in all 50 states
4 - If you get pulled over by a cop having a bad day he/she has every right to have your **** towed and impounded.

Even with me not caring about the smell I've got a catted X going on. No reason to run catless unless you are being a cheap *** or think louder=better. High flow cats do not rob any noticeable power and it is one less thing to worry about. Guarantee if you are running catless in a state that cares about emissions you will be puckering up bad the first time you are pulled over.
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Old 10-30-2015, 09:21 PM   #13
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Wouldn't say being a "cheap a$$"
No cats has a big role in power adder choice and HP your making.


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Old 10-30-2015, 10:12 PM   #14
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Have you ever sat at a traffic light behind a catless car?
And more importantly, in my opinion, people that do this are selfish and don't care about you, your children, or the rest of us that live on this planet.
If you need to have every little bit of horsepower available build a dedicated track car.
Just sayin
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Old 10-30-2015, 10:14 PM   #15
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Have you ever sat at a traffic light behind a catless car?

And?


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Old 10-30-2015, 10:36 PM   #16
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And?


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Old 10-30-2015, 10:39 PM   #17
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Well said...... Actually a little worse
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Old 10-30-2015, 10:40 PM   #18
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Sounds like a lot of complaining to me


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Old 10-30-2015, 10:42 PM   #19
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What are you complaining about
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Old 10-30-2015, 11:19 PM   #20
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Have you ever sat at a traffic light behind a catless car?
And more importantly, in my opinion, people that do this are selfish and don't care about you, your children, or the rest of us that live on this planet.
If you need to have every little bit of horsepower available build a dedicated track car.
Just sayin
I never understood the role of cats in emissions. Instead of producing Carbon Monoxide a car with cats produced Carbon Dioxide which is a greenhouse gas.

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Old 10-31-2015, 12:03 AM   #21
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Wouldn't say being a "cheap a$$"
No cats has a big role in power adder choice and HP your making.


🍼and 🌽 fed coyote.
I'm going to go out on a limb and assume he is NA Coyote here... If one is running a TON of power or turbos or some extreme situation then yeah.

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And?


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Some ppl have delicate noses. Then again, I'd be willing to bet that there are ppl on here or other forums who would complain about exhaust smells and then light up a cigarette.

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Attachment 193091catless smells like walking by a salon while someone is getting a perm


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Old women, mothballs and hair product smells NOTHING like a properly tuned catless vehicle.

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Sounds like a lot of complaining to me


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You work in the oil industry, I work around jet fuel and all sorts of hazmat. I dunno lol.

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I never understood the role of cats in emissions. Instead of producing Carbon Monoxide a car with cats produced Carbon Dioxide which is a greenhouse gas.

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I will not argue that the EPA hasn't drastically cleaned up the air in many locations. Look at pics of cities in the early 70s vs now. Look at China. But cats are pointless. Much of the "cleaning up" of vehicle pollution is simply making cleaner running vehicles. I'd be willing to bet almost every newer vehicle out there that is in good working order would pass a sniffer without cats. Not to mention livestock produce 4x as much greenhouse gas as vehicles IIRC.
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Old 10-31-2015, 12:04 AM   #22
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I just have always tried to figure out why we need cats. Isn't Carbon Monoxide supposed to be an odorless gas? Maybe it is more of a safety thing than anything

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Old 10-31-2015, 12:11 AM   #23
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Are you trying to justify removing catalytic converters? If so you are only fooling yourself.
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Old 10-31-2015, 12:26 AM   #24
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I already have them removed. I don't need to justify anything for myself. I'm just trying to figure out why they are necessary for emissions

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Old 10-31-2015, 04:41 AM   #25
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Are you trying to justify removing catalytic converters? If so you are only fooling yourself.

Sounds like your justifying having a slow car


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Old 10-31-2015, 05:26 AM   #26
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The smell isn't really that big of a deal.

Some people have fitment (as in leaks) issues with certain brands, if I remember correctly. I have JEGS, there were some leaks, but they have been fixed.


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Old 10-31-2015, 05:49 AM   #27
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Jba here 0 issues

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Old 10-31-2015, 08:03 AM   #28
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The no cat smell is good, I dunno wtf you guys are talking about.
pump gas smells nasty, sorry, it just does. race fuel on the other hand smells great
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Old 10-31-2015, 08:03 AM   #29
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Sounds like your justifying having a slow car


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Sounds like your getting kind of personal... I don't think your allowed to do that on this forum. Cupcake.
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Old 10-31-2015, 08:10 AM   #30
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I Don't believe what you guys are saying.. You don't know how cat converters work? Come on guys, we are supposed to be car guys.
All you have to know is, it's against the law.
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Old 10-31-2015, 08:59 AM   #31
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This is the problem with people these days. Someone voices their opinion and someone else gets butt hurt about it... Get over it


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Old 10-31-2015, 09:52 AM   #32
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Far too many ppl get butthurt about dumb ****. And yes, removing cats is super illegal anywhere. But it's one of the most done things. I dunno if it was me and I had to run catless because of turbos or whatever I'd at least run dummy cats.

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Old 10-31-2015, 10:02 AM   #33
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Cats were introduced to deal more with smog, primarily. That means HC or airborne hydrocarbons that made big cities like LA look like they were on fire in the 70s. The improvements in car engine design, the introduction of EFI and powerful engine management has made them a little less relevant than they once were. That said, I am not pulling them off my 2014. The only thing that would make me do that is an extreme power adder, as they tend to melt them and that can lead t engine damage.
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Old 10-31-2015, 10:16 AM   #34
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What kind of gains with removing cats?


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Old 10-31-2015, 10:29 AM   #35
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depends.....no tune? very little if any, because the stock tune has cat overtemp that will be triggered by the absence of cats and richen the mixture, killing power. Tuned for it? maybe 15-20 horse at the top end. Power adder? easily 30-40 horse with an appropriate tune revision.
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