Stock exhaust question. 01 FXD
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Cruiser
Joined: Jul 2013
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From: Yokosuka Japan
Stock exhaust question. 01 FXD
Got a stock exhaust today.and wanted to know if anyone know which pipe gets the muffler with the cat. in it. I THINK it goes on the rear head pipe (so top muffler) but I'm not 100%.If it even makes a difference. With the built in crossover it may. But I have no idea. Figure if I have to run it I might as well at least do it right.
Outstanding HDF Member
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From: Niagara Falls, Canada.
I have a 2003 and don't have a 'cat.' in my o.e.m. exhaust. Just guessing that you may have a Cali. model. Are you having to run with a 'cat.' due to traffic laws in your country ?
Road Master
Joined: May 2005
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From: Pennsylvania
pulled the whole thing on my 2025 fat boy and put on a cobra el diablo 2-1
very affordable compared to a lot of aftermarket exhaust systems, sounds awesome, makes great power, looks sweet. no regrets
very affordable compared to a lot of aftermarket exhaust systems, sounds awesome, makes great power, looks sweet. no regrets
Seasoned HDF Member
Joined: Sep 2008
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From: San Diego, CA
I am not well versed on International exhaust regulations, but.....
I have never seen a domestic Harley with a dual exhaust and two mufflers, where one muffler had a CAT and the other did not. Even with the crossover, it makes no sense to have just one muffler with a CAT...
If CATs were required, both mufflers had them. In 2001, CA bikes had two #65844-95A mufflers w/CATs, while the 49 states (and Canada) bikes had two #65747-90A mufflers w/o CATs.
In 2001, Harley offered two International Dyna muffler part numbers. One had a CAT, the other did not.
I believe the HDI muffler #65388-97A w/o CAT, was for international markets where CATs weren't required. In markets that required CATs, like Japan, I believe the bikes were shipped with two of the HDI mufflers #65868-97A w/CAT.
I believe you are supposed to have two #65868-97A on your exhaust...
Forgive me if I am wrong, but I would be shocked to hear an emissions requirement for a bike to have one cat muffler and one without, on a dual exhaust system..
Oops, just noticed this thread was started over a month ago... I wonder if the OP is riding around with one cat muffler & one non-cat muffler.... ?
Last edited by hattitude; Sep 11, 2025 at 09:19 AM.
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Seasoned HDF Member
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From: San Diego, CA
Boy, when I'm off, I'm way off....
I saw the month/day, and totally missed the year...
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