Call the shop and ask them what they would suggest. It seems common (at least based on threads I've read) for folks to have a resonator or something put in line with the muffler to deaden the sound. I had a Magnaflow on my Durango and love the burble and sound but I also felt that on road trips the drone inside the cabin was tiresome...
Jeff Z. (the "not quite as skinny" one)
'97 FZJ80 Antique Sage AE #267, stock
12/74 FJ40, 2F, SM420, 4" Lift, ARBs, 33" MTRs
"...anything else i can do for you guys, how about i wash your car or mow your lawn while you figure out your firewall system? I am now boarderline insane/unibomber." Kipper
"That assumes I'm even capable of pulling and stabbing..." Jacket
"I really like having a detachable unit." Beater