As with all things automotive, it depends on your wallet weight.
As mr280zxt posted, Jeff was working on an really nice 3" stainless system including downpipe. The system, though costly, was arguably the best a person could get, certainly beyond the needs of many of us.
Lesser options are: new 2 1/2" exhaust with hiflow muffler (I have a Dynomax and love it), a 3" system with similar muffler or for more money, you can contact Jeff or Scottie for a custom 3" stainless downpipe to go with the rest of the exhaust system.
As far as I know, there are no production headers around for turbo Z's so its strictly a manifold back deal.
Dan