i had a single exit before my rear tire but ended up going to duals out of the back. it just got too annoying on the highway having the exhaust exit so close to the cab. however, i did just have a glasspack (straight through muffler) on there so it was pretty loud.
i just got a muffler and tips to get mine done the same way. I had second thoughts of a muffler shop being able to install 18" tips that way but I guess if some guys already have it done then no problem? hopefully I can post up a pic of mine installed here in a couple days
I think I have pics in my gallery of mine, I also attached pic of underneath the truck for another person asking this same question, might be able to search and find it. I have 3.5" slash cut tips exiting that are 18" long
I love mine personally but there is drone. I had single 4" tip coming out there on my last ram and this one has dual 3.5" tips....my girlfriend complained the other day that she is going deaf in her right ear so thats not so good I guess.