I sold the Z a few months ago an am now getting around to selling the few parts I had for it. The axleback and midpipe are a great combination. It's a mixture of H-pipe and y-pipe sound.
Everything is in excellent shape, just needs to be cleaned.
1) Garageline X-pipe and midpipe combo - $400 (pm about shipping)
-Needs 2 gaskets. All bolts included (4 bolts + 4 nuts)
2) Topspeed axleback - $225
-Uses stock gasket and stock hardware on Y-pipe
3) Z1 post MAF intake tubes (red) - $75
4) Also have a Nismo muffler for sale. Starting price is $200, but I'm willing to sell for dirt cheap if sold local.