Muffler Changes
Seasoned HDF Member
Joined: Sep 2018
Posts: 6,040
Likes: 1,816
From: Kalifornia
The Sportsters from 2014 on have the crossover between the two header pipes.
Your muffler change should not change the crossover effects.
The AFR (Lambda) values in the fuel table are richer in the closed loop range on the 2014+ Sportsters compared to the 2007-2013 tunes.
The earlier EFI Sportster models 2007-2013 had the crossover connected to the mufflers.
The ECM is able to adjust the closed loop AFR (lambda) using feedback from the O2 sensors so unless the change required is outside the allowable limit to set a code you should be ok.
Once you get to about 25-30% throttle position or over 4500 rpms you will be in open loop and the AFR will be in the 13.5 to 12.5 to 1 range even on a stock Sportster.
If you get codes for rich or lean than you would need to adjust the tune.
It is common belief that you need to tune if you change both exhaust and Air cleaner.
Your muffler change should not change the crossover effects.
The AFR (Lambda) values in the fuel table are richer in the closed loop range on the 2014+ Sportsters compared to the 2007-2013 tunes.
The earlier EFI Sportster models 2007-2013 had the crossover connected to the mufflers.
The ECM is able to adjust the closed loop AFR (lambda) using feedback from the O2 sensors so unless the change required is outside the allowable limit to set a code you should be ok.
Once you get to about 25-30% throttle position or over 4500 rpms you will be in open loop and the AFR will be in the 13.5 to 12.5 to 1 range even on a stock Sportster.
If you get codes for rich or lean than you would need to adjust the tune.
It is common belief that you need to tune if you change both exhaust and Air cleaner.
Seasoned HDF Member
Joined: Sep 2017
Posts: 12,233
Likes: 4,943
From: England
Look again at the second picture and you can see where the exhaust pipe fattens, that is the muffler. The cross over pipe is a few inches in front of that and you can see at the front where it curves up to the header.
Last edited by Andy from Sandy; Jan 1, 2020 at 01:02 PM.
Road Captain
Joined: Mar 2007
Posts: 612
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From:
https://www.ebay.com/itm/Emgo-slip-o...UAAOSwvcBczHfn
These have worked well for me up to 2013. I'm sure they have them for 14 and up too.
These have worked well for me up to 2013. I'm sure they have them for 14 and up too.
Last edited by hogdad; Jan 1, 2020 at 06:47 PM.
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