I have axle back for 370Z I'm looking to sale, bought it slightly used for my G37 coupe (prob less than 1000 miles), but the tips stick in some, so considering selling~ I'm in Texas, I also have mid-pipe, but I purchased that new, not sure if it's compatible with 370Z...if I was to ship would probably be $1400 shipped (muffler only) probably do $1700 for both if the mid-pipe fit.
Here's some pictures of it, and a sound clip on myg37 on my car.
Zydan's Mod Log - Page 10 - MyG37