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Hollowing Out The 919 Catalytic Converter - Benefits?

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11K views 21 replies 13 participants last post by  Bryce919er  
#1 ·
So, anyone remove the catylist from their 919's exhaust system? Did it make a seat of the pants difference you can feel? Any complications and what modifications did you have to make.
I've removed these from my pickup trucks in the past and know the differences it can make.
I just want to know if there's any reason NOT to do this to the stock pipe.
I want it to appear as though the bike still has one inline for all tree hugging folks who care about such things.
For anyone who has never removed the BIG Government mandated catalytic converter from one of their automobiles, they seem to rev a little quicker, have better throttle response and get more miles out of a tank of fuel.
I would suppose it would have similar results from a Moto.
 
#5 ·
My 07 600RR has a cat. That bike runs so clean, I'd never dream of removing it.

I don't know if the Cali models have one or not. Our 48 state bike does not. If I had one I'd keep it. Hell, I'd even consider swapping a cat mid pipe just to see if there is any difference.
 
#9 ·
I removed mine also, but didn't notice any power difference. I do believe I did notice a little difference in sound but it's been so long I really don't remember very well. But there are definitely no problems.
 
#11 ·
Other way round!

My Hornet 900 started out in life without a cat. However, I had really bad problems with exhaust fumes stinking up my jacket (and my ponytail when I used to wear my hair long). It's a very long story, but Honda UK referred the stink problem back to Honda Japan, and Honda Japan eventually decided that I should have a cat fitted to my bike to cure the stink.

When I had the replacement Y-section fitted on my exhaust, with a cat for the first time, they also changed the ECU, as they said that the old one would be unsuitable for the new catted set-up.

I must admit that, while the bike's characteristics were somewhat changed, much to my surprise I preferred it with the cat. It seemed to smooth out the slightly snatchy throttle, and added a bit more mid-range. Fuel consumption was unaffected, and I can't say that I noticed any change in the noise. But it did more-or-less get rid of the stink problem too, so I was a happy camper.
 
#19 ·
I was afraid when I punched my cat that I was going to get the stinky smell but I never noticed a difference. Also I had just added a PCIII at the same time. So I may have made up for any throttle changes that may have been felt.
 
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