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[RichardGee]

I am replacing after-market mufflers on my 2012 CVO Ultra with the stock mufflers.
Trying to determine WHY other year mufflers (that look IDENTICAL) have a different part number?
Can anyone define the difference in the following examples?
btw: the Catalytic converter on these models is in the header pipes, so that is Not the difference in p/n's

2012 CVO Ultra OR Street Glide
64900111        MUFFLER, LEFT, (CHROME) (DOMESTIC, CANADA, CALIFORNIA)
64900112        MUFFLER, RIGHT, (CHROME) (DOMESTIC, CANADA, CALIFORNIA)

2013 CVO
64900198        MUFFLER, LEFT, (CHROME) (DOMESTIC, CANADA, CALIFORNIA)
64900199        MUFFLER, RIGHT, (CHROME) (DOMESTIC, CANADA, CALIFORNIA)

I would ADD that looking at the CVO Ultra, SG, RG, mufflers from, say, 2009 through 2014, I see NO physical differences. They all look interchangable to me.. Does anyone have the details?

[Delta]

I wonder if it has anything to do with the EPA model year stamp on the muffler.

[waynel]

Didn't really notice any difference.  I put fulsac baffels in my 2011.5 ultra classic and just put some in my new 2014 ultra limited.