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With the body changes in 2009 I don't know if an earlier year catback will work or not.
I did some checking on the Borla site...nothing for your truck there. All Magnaflow shows for a 2500 is a catback for the 2007 diesel Ram. I decided to stop there.
Here's an alternative to a manufactured catback. I had a hard time finding one for my MegaCab so I had my local shop supply the single in/dual out muffler and fab up some new tailpipes. That way the system fit and we didn't have to figure out how to piece in parts to make a catback system fit.