From what I've gathered Termignoni is only producing cans and pipes for the S4R-749-999 these days, I could be wrong.
Here's a pic of Termi Ti rounds on my bike. I really like them (even though they were over-priced about $200 IMO), but in hindsight I probably would have purchased SIL megaphones. You might see mine in the DML classifieds soon.
I had a Termi full system (high-mount, carbon fiber) put on at my 600 mile service and have loved it ever since! ;D They are probably the most expensive, but oh well. They don't seem too loud when I'm riding, but I heard the service tech ride my bike around the parking lot one day and absolutely loved the sound!