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I doubt that there's any significant gain.

So, it'll take some effort, probably not make any difference and it's not reversible.
 

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If by decating you mean removing the material from the catalytic converter, I suggest considering an arrow race header instead. Yes, it makes difference.


If by decating you mean the process applied to woollens and worsteds, man-made and blended fiber fabrics, and various types of knits. I agree, lots of work, not much gain.
 

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Decatting or De-Catting or Cat-Delete might get it into more search results in the future. Maybe the OP might consider a title edit? Rick's link here to his thread about his experience is gold.

Cheers,
Glenn
 

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Cost\Performance ? I've been down that road before, and found it not worth it. Would it be more cost effective to buy a Hayabusa, put ATV High bars, a Day-Long seat and some paniers on it ? They come in red and grey this year.

 

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Yeah, this thread title had me scratching my head when trying to read and understand it's meaning. o_O
I was reading it as dē-kay-ting ?
On my way to work selling cars one day, my ol' '80 Crown Victoria "self-decated" unbeknownst to me. The first indication I had was a burnt fur, hot plasticy-paint smell. Then I saw that the passenger well carpet had whisps of smoke rising. I got to the dealership without immolation and called our "bone specialist" (salvage buyer). Never saw that car again.
 

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I recently recatted my 2001 4Runner. cost me $380 plus installation. Smog control, you know.
Messing about with things that try to protect the atmosphere is kinda silly. You gain nothing by decating.
 

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What do you hope to gain? Replacing the entire exhaust would make it a little lighter, but should probably include a dyno session to retune the engine, not so much for performance but just to get the mixture right. Probably minimal power gains without getting into the engine. Could try to turn it into a race engine with much higher compression (race gas), wilder cams, different airbox, adjusted timing. Not sure the bottom end or tranny is up to much gain, though, and probably need a better clutch and a bigger radiator. And at the end of the day, it will still not be a performance bike. And you've given up reliability and social responsibility. Personally I think the relatively flat torque curve and docile power make the bike more enjoyable to ride. And I've never been a fan of noisy bikes.

Frankly, my K2 never seemed underpowered in normal street riding. Sure, there are faster bikes out there (my FJR1300 being one) but most of the extra power goes unused most of the time.
 

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This is a very long story so I will just keep it short.
A family member inherited a car, it would work great on the highway but get hot in city traffic after leaving the highway,
It never overheated it just got high on the gauge, after being told the motor needed a rebuild and having that done the problem persisted.
He had a exhaust leak and took it to a exhaust specialist, they discovered the cat had been gutted, they told him what symptoms he would see from having that cat gutted.
They were his exact symptoms, cool on the highway hot in traffic.
A new cat cured his problems, he then returned to people who rebuilt his motor a demanded a refund, they were the ones that gutted the cat in the first place.
Since I know first hand this story to be true I don't gut cats.
 
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Aftermarket pipes and/or mufflers will often "de-cat" your system and save you some weight. Possible to also give you one or two HP. Just removing your cat will likely not do much at all. If you are looking for performance, there are some things you can do, only one of which is cheap.
 

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We went away to Lightning Ridge Lightning Ridge, NSW - Aussie Towns a couple of weeks ago in our 2003 Range Rover for our 50th wedding anniversary (we were supposed to go to NZ). We did a bit rough dirt road work. Whilst in LR, I could hear this noise from under the car when cold. There are no Land Rover dealers out that way so I took a punt and drove it home.

The next day I took it to my local Land River independent mechanic and put the car on the hoist. Yep, the left hand cat had collapsed and the core was rattling around inside. I'll get it replaced but with the lockdowns at the moment, I can live with it. We have our Forester to use.
 

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Sure.....decat the bike. While your at it....

Dump your waste oil in the sewer.
Throw your cigarette butts and trash out the car window.
Buy straight pipes while your at it, for maximum horsepower gain.

We only have one place to live, why crap in it?
 

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Sure.....decat the bike. While your at it....

Dump your waste oil in the sewer.
Throw your cigarette butts and trash out the car window.
Buy straight pipes while your at it, for maximum horsepower gain.

We only have one place to live, why crap in it?
This. So much this.

Why are so many so quick to remove the equipment and settings that are designed to minimize our impact on the world around us?
 

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I de-catted my 14 V2. Made it a little cooler in the heat, but that's about it. I'm pretty good with a TIG welder so it was easy.

I've de-catted tons of motorcycles just because the exhaust being where it is makes the heat unbearable, especially in the warmer climates. Never a car or truck though. I just laugh at how many people think a cat is necessary on any engine. It only came about as an emissions thing. Do some research, you'll see that no engine on the planet requires it to run best.

And regarding emissions, motorcycles are such a small fraction of total vehicle emissions it's a drop in the bucket. You wanna talk carbon footprint, how many kids do you have? Because you're responsible for their entire carbon footprint for the rest of their lives. Recent research shows one child is equal to 36 trans-Pacific round trip flights per year.
 
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I've de-catted tons of motorcycles just because the exhaust being where it is makes the heat unbearable, especially in the warmer climates. Never a car or truck though. I just laugh at how many people think a cat is necessary on any engine. It only came about as an emissions thing. Do some research, you'll see that no engine on the planet requires it to run best.
No one said they were there to improve power.

They are there to burn leftover hydrocarbons from exhaust gas. These are harmful in more than one way. Before catalytic converters I can remember my eyes burning from exhaust gasses on main street when it was busy. Cat's cleaned that up a LOT. While there are few motorcycles, in the big picture, the fact is that converters on them have hardly any negative effects. I have never noticed heat to be an issue, but of course that could be in some cases. While aftermarket headers and muffler systems can make more power, just hammering out the contents of the cat on a stock bike will only make it sound a little faster. You likely could not feel any real difference.
 

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No one said they were there to improve power.

They are there to burn leftover hydrocarbons from exhaust gas. These are harmful in more than one way. Before catalytic converters I can remember my eyes burning from exhaust gasses on main street when it was busy. Cat's cleaned that up a LOT. While there are few motorcycles, in the big picture, the fact is that converters on them have hardly any negative effects. I have never noticed heat to be an issue, but of course that could be in some cases. While aftermarket headers and muffler systems can make more power, just hammering out the contents of the cat on a stock bike will only make it sound a little faster. You likely could not feel any real difference.
You're correct, I will not disagree with anything you said. My experience has been a cooler feeling motorcycle with very little if anything else gained. Riding my V2 in the desert SW, and once into Las Vegas when the dash said 117F, made me want every cooler degree I could have. The next step was header wrap but I ended up selling it instead.
 

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Pro: weight saving. That catalytic converter can be quite heavy.

Neutral: they rarely produce any significant additional back pressure unless they're blocking up

Con: you'll fail emissions testing and potentially face additional big fines for disabling emissions control equipment IF you are caught. The cat also helps stop backfiring due to lean mixtures
 
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