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I think the "cow stomach" is a pre-muffler.

According to ducati.com, USA S4R's don't have a cat.

Not crackin' your nuts, just passing on AFAIK info.......
 

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Discussion Starter · #3 ·
The owners manual identifies it as a "Catalyser"
If it is a premuffler, it is the ugliest design yet.
 
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i my be wrong but i had thought that the 45/50 hi pipes for the MS4 would work on the S4R . it's something to think about .
 
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