I had a set of 2011 CVO Street Glide mufflers on my 09 Classic(no cat).They are a nice looking pipe but they were quieter than stock,I didn't like the sound at all.But that's just my opinion.I went from the CVO pipes to a set of 4" Rineharts.I love the sound and the performance gain,according to the seat dyno.
There was a couple of years where cats were in the mufflers and not the header. I don't know for sure, but I was thinking that the 09's were like that. Somebody weigh-in on this please.
Ive been told to meet EPA compliance, the stock CVO Ultra mufflers our more restrictive than stock Ultra mufflers because of the increased motor displacement. I friend of mine has a 2010 CVO, when he had the stock mufflers on the bike, it was very queit.