Help Needed to ID these mufflers

I'm guessing you have a 550 (133) Right one from 8th week of 2001
and a 575 (133E) Left one from the one from the 39th week of 2003

But that's just a guess.

 

That’s a good guess. 550 and late version 575 I believe. Although they look similar the internals are different.
I ended up with an odd set like that. Still have the late 575. Would have to look up which one if someone wanted to make up a set.
Bill
FL

 

At Assembly Number 51797 in late Summer 2003, the 575M changed over from a center resonator to straight center pipes and used a new muffler set to make up for the lower back pressure of the straight pipes. 200997 was the right hand muffler and 200998 was the left side muffler. I gave a set of those away when I fitted Superamerica HGTC mufflers to my 575M.

167998 was the right hand 550 muffler, as others have stated, and 167999 was the left hand muffler.


Those two have different guts and would not make a good pair on any Maranello. They all look similar from the outside, however, so somewhere out there is likely another mismatched set and an owner may be wondering why his V12 does not run well.