cat removal from 10 headpipe audio file
Seasoned HDF Member
Joined: Jan 2007
Posts: 20,616
Likes: 4,440
From: anacoco, la
I've done the same thing to my 2010....she sounds pretty good, but she don't sound like that.
Maybe it's the difference in the amount of discs in the muffler, as I am still running the setup as it came out of the box.
Thinking of trying the extra 5 discs, and maybe even the open endcap on mine to see if that helps some.
I am assuming that you have experimented with that kit also?
If so, how did you like those results?
Maybe it's the difference in the amount of discs in the muffler, as I am still running the setup as it came out of the box.
Thinking of trying the extra 5 discs, and maybe even the open endcap on mine to see if that helps some.
I am assuming that you have experimented with that kit also?
If so, how did you like those results?
remember, if its hot outside the engine, then it is doing its job and getting the heat out of there instead of keeping it in. plus i like getting upwards of 45-50 mpg.
what was your bike doing that you determined that a tuner was necessary?
Road Captain
Joined: Apr 2010
Posts: 709
Likes: 1
From: Maine
Cat removal
You can put the nightstick on with the cat in the pipe and no tuner. The cat is the governing factor in exhaust restriction pretty quickly when putting slipons on. Once you remove the cat you are going to lean out an already lean system. My bike had some snapping and serious hesitation in the throttle till i threw a PCV on it. Of course i am very close to sea level here. I'm sure that you are not doing the engine anything positive other than saving a few hundred dollars right now without the tuner. I put a new engine in my bike and switched to the SEPST so i have a whole other set of tuning issues to iron out again.
Seasoned HDF Member
Joined: Jan 2007
Posts: 20,616
Likes: 4,440
From: anacoco, la
well, like i said before i do not have the stage 1 a/c, i am still running the stock air box. the ecm will compensate for the change in the exhaust.
now if i were to add a more free flowing ac, i would definitely do the fuel tuner.
as is, my plugs look great, the engine runs good with no performance issues.
Outstanding HDF Member
Joined: Oct 2007
Posts: 3,437
Likes: 15
You can put the nightstick on with the cat in the pipe and no tuner. The cat is the governing factor in exhaust restriction pretty quickly when putting slipons on. Once you remove the cat you are going to lean out an already lean system. My bike had some snapping and serious hesitation in the throttle till i threw a PCV on it. Of course i am very close to sea level here. I'm sure that you are not doing the engine anything positive other than saving a few hundred dollars right now without the tuner. I put a new engine in my bike and switched to the SEPST so i have a whole other set of tuning issues to iron out again.
Club Member
Joined: Oct 2006
Posts: 1,582
Likes: 72
From: North East
It's my understanding that states that initiate motorcycle emissions testing exclude previous model years and only require testing on model years going forward. Is that an accurate understanding or have there been states that require emissions testing on previous model years?
I often read of motorcycle owners that keep their OE exhaust systems "in case" emissisons testing is started. I don't know if that is a real possibility or paranoia.
Road Master
Joined: Sep 2010
Posts: 836
Likes: 1
From: Rocky Hill, CT.
I can give you an audio file but all you will hear is the whole friggin pipe going "clank" into a dumpster.
Road Captain
Joined: Apr 2010
Posts: 709
Likes: 1
From: Maine
Removing cat
I assumed if you went as far as cutting your cat out that you would put a better flowing a/c on. They say the cat flows good but my pipe did not turn orange after the cat was removed and fuel management added. To meet emissions the cat has to raise temps so it causes some restriction i would say.
Stage IV
Joined: Aug 2010
Posts: 4
Likes: 0
Removed the cat
I am on the fence on air flow with the cat.
My Son and I cut it in half and removed
the cat material. I then took a small chunk
that was kinda in one piece and looked
through it toward the light. I was surprised
on how much light was visible.
With that said, without cat should run cooler.
Unable to ride as we are in blizzard conditions
in Minnesota, so cannot tell on performance.
Anyone using snow chains on an Ultra???
My Son and I cut it in half and removed
the cat material. I then took a small chunk
that was kinda in one piece and looked
through it toward the light. I was surprised
on how much light was visible.
With that said, without cat should run cooler.
Unable to ride as we are in blizzard conditions
in Minnesota, so cannot tell on performance.
Anyone using snow chains on an Ultra???
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Banned
Joined: Apr 2008
Posts: 2,492
Likes: 10
You can put the nightstick on with the cat in the pipe and no tuner. The cat is the governing factor in exhaust restriction pretty quickly when putting slipons on. Once you remove the cat you are going to lean out an already lean system. My bike had some snapping and serious hesitation in the throttle till i threw a PCV on it. Of course i am very close to sea level here. I'm sure that you are not doing the engine anything positive other than saving a few hundred dollars right now without the tuner. I put a new engine in my bike and switched to the SEPST so i have a whole other set of tuning issues to iron out again.
Mark
Road Captain
Joined: Apr 2010
Posts: 709
Likes: 1
From: Maine
[QUOTE=ONEDOWNAND5UP;7643212]I have to politely dis-agree..The mufflers and or removing the catalytic converter will allow more exhaust gasses to pass by the O2 sensors, resulting in a higher 02 reading, resulting in the ECM adjusting more fuel in it's limited range. Unless you increase the air in, it won't get leaner.I ran slip-ons for a 1000 miles with no issues.
How will more gases pass by the 02 sensors if you won't let more air in? I'm not an engineer so i can't argue this, and most would upgrade their intake too if trying to free up their exhaust. Don't think there is very much adjustment in the 12mm narrow band 02s. What would be the purpose of modifying the exhaust and leaving the restrictive air box on, sound? Kind of like rebuilding one cylinder cause funds are low.
How will more gases pass by the 02 sensors if you won't let more air in? I'm not an engineer so i can't argue this, and most would upgrade their intake too if trying to free up their exhaust. Don't think there is very much adjustment in the 12mm narrow band 02s. What would be the purpose of modifying the exhaust and leaving the restrictive air box on, sound? Kind of like rebuilding one cylinder cause funds are low.