ARC went under a couple of years ago, then I believe they were relaunched in 2012. A lot of parts are no longer in production, mainly just coolers, radiators, air boxes etc. now. I don't think they do exhausts.
You can see here - http://www.nengun.com/arc/
You could contact Nengun and have them find out. I'm a big fan of ARC, and Titanium is nice, I get the appeal but personalty I'd be looking at a stainless system with perhaps a titanium can etc for looks.