The company I used is down here in Orange county. You tell them what you have and they create a flash tune for you. It is the type of thing where you remove the stock ECU and send it to them and they flash the software and send it back to them. I will go find the card and PM you.
SoCal Z Enthusiast contact me to get on the list. Events for like minded people and when you talk about your Z, we will know what you are saying.