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exaust pipes
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Stage I
Joined: Dec 2013
Posts: 1
Likes: 0
From: kansas
exaust pipes
Want to install new aftermarket slip-on mufflers to my new ultra classic, was told that i would have to have adjustments done to injection controls to do this, can anyone clear this up for me?
Last edited by Mike Schrier; Dec 25, 2013 at 12:45 PM.
Extreme HDF Member
Joined: Sep 2010
Posts: 14,744
Likes: 402
From: Phoenix '53, '88, '09 Big Twins
usually with 2010+ models, the catalytic converter in the exhaust header is the determiner of flow- swapping mufflers has little effect on overall flow with the upstream bottleneck created by the catalytic converter.
the cat also dampens sound (many of us remove it for performance reasons), because of this you may not notice huge difference in exhaust note.
you might do well to go to a bike event and hear other bikes, determine what you like ( and don't) and make your choices based on that.
if the bike is under warranty, you may want to keep it warranty compliant until the motor is proven to be happy
some of the guys on this forum are on exhaust system 2,3 or even 4...that gets spendy!
as far as tuning the EFI, there are a number of methods from $125 ( what I use) all the way to $800~900. depends on the riders expectations, anticipated future needs and the components swapped
mike
the cat also dampens sound (many of us remove it for performance reasons), because of this you may not notice huge difference in exhaust note.
you might do well to go to a bike event and hear other bikes, determine what you like ( and don't) and make your choices based on that.
if the bike is under warranty, you may want to keep it warranty compliant until the motor is proven to be happy
some of the guys on this forum are on exhaust system 2,3 or even 4...that gets spendy!
as far as tuning the EFI, there are a number of methods from $125 ( what I use) all the way to $800~900. depends on the riders expectations, anticipated future needs and the components swapped
mike
Last edited by mkguitar; Dec 25, 2013 at 04:46 PM.
Elite HDF Member
Joined: Jun 2006
Posts: 3,572
Likes: 5
From: Templeton California
Its nice to get something with some kind of adjustability built in.Either Supertrapp stackable disc or American Customs drillable bafffles style.That way if you're not completely happy with the sound you can modify it somewhat.There are also some other brands that you can change the diameter of the baffles for more or less sound.This will also affect back pressure which changes the way it runs.But in the end so long as you don't change both the intake and exhaust you shouldn't need to do anything else just changing the mufflers should be fine.
Ultimate HDF Member
Joined: Mar 2012
Posts: 6,129
Likes: 143
From: Santa Cruz
Just changing slip-ins on a '10 up bike isn't gonna change airflow enough to effect much, but they all run EPA lean causing heat and ping. A proper flash tuner and tune is the best thing ya can do for even a stock engine.
6th Gear
Joined: Sep 2012
Posts: 12
Likes: 0
From: Ohio
If you just change mufflers or headpipes or both, you do not have to do a tuner. This is all behind the 02 sensors. If you change you air box, then a tuner is required. Your air flow will not change with mufflers or catless headpipes only the sound will change.
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MY bike and MY money...
I wouldn't change ANYthing engine related without a tuner.
INCLUDING, but not limited to intake and exhaust.
This is, however, YOUR bike and YOUR money.
For the life of me I can't figure out why a man will spend $25,000 on a motorcycle, then balk at $500 to make it run right.
Does it need a tuner without any changes? While it would make it run better, it is likely not necessary, but once again, if it were me, the FIRST thing to buy is your tuner.
I haven't made a change to my '14 yet, the first order will be my tuner. Saving up money, tough to do around the holidays.
Just MY 2 cents, YMMV.
I wouldn't change ANYthing engine related without a tuner.
INCLUDING, but not limited to intake and exhaust.
This is, however, YOUR bike and YOUR money.
For the life of me I can't figure out why a man will spend $25,000 on a motorcycle, then balk at $500 to make it run right.
Does it need a tuner without any changes? While it would make it run better, it is likely not necessary, but once again, if it were me, the FIRST thing to buy is your tuner.
I haven't made a change to my '14 yet, the first order will be my tuner. Saving up money, tough to do around the holidays.
Just MY 2 cents, YMMV.
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Elite HDF Member
Joined: Jun 2011
Posts: 3,832
Likes: 127
From: Coastal Carolina
Simple answer--No. If you put on slip-ons, no ECM adjustment is required. ECM adjustment is required if you change the air intake, which is the ONLY thing that changes airflow. (Despite some of the other comments, the CAT does not restrict airflow and removing it will produce no performance improvements. The only thing that it does is reduce the heat produced by the CAT itself, which many of us--particularly those without lowers--don't find to be a problem.)