I bought these slightly used off another forum member, they were installed and pulled from his car by GTM while it was getting work done, the car never left the shop. I never used them myself as I went for larger injectors to run e85 down the road (1050cc).
This is a balanced set of 6 injectors and will plug directly into the factory harness (denso) on any Z or G.
$350 shipped
More info here