All the info you need is right there in all the replies above.
Generic plug and play tunes are still relevant but definitely out dated.
They were aimed at giving people a tune which could just be thrown in the car and off ya go. (Take ya money and see ya later sort of thing.)
As Keith said get it to a Vic tuner, give him ya car and ya money and you won't regret out laying some hard earned coins.
Definitely get in contact with the tuner, tell him you wanna do injectors, high flow cat and a custom tune. He will either source the stuff for ya or send you away with a shopping list of goodies to get before tuning it.
Suggestion: Mick at Pitlane performance.
Plenty of other good tuners in Vic to help you out, get on the ferry.