Fatboy Euro models have had them since the mid-1990's.
Fatboys and Other softails have had them since 2008 for Cali/Euro models.
All since 2010. They're small and in the mufflers. If you weighed the 2007 muffler VS 2010, the weight difference is noticable just picking them up. Touring has them in the headpipes.
I have a pre-2010 cat in a RK muffler at home. Compared to a regular RK muffler, I bet it's 4-5 lbs heavier.
“When the going gets weird, the weird turn professional....” ~ Hunter S. Thompson~
R.I.P. Rubberdown. 1971-2012