took me about a year to get rid of mine. Its not a money thing, you have to wait for someone that is getting rid of their Z that already has aftermarket exhaust. Then on top of that, that person is going to have to want to go back to stock and swap everything out.
Figuring only about 3% of Zs are modified and only 1% of that percentage actually will spend the time to swap stuff and go back stock/resell aftermarket parts. Moral of the story is you have sometime to wait so dont hold your breath. Unless you get lucky, find a warm place in the garage for it.
In reference to a post above in comparison to a G35. Muffler section is the same, only the mid-pipe on the two cars differ. G35's is about 8 inches longer.
free bump