I spent ages emailing and ringing them to get decent info, only took me 3 months. They didnt answer too many questions well, and just couldnt giveme a straight answer but eventually after .. o n e a t a t i m e...
If you do ring them speak with Shane.
Im trying to remember off the top of my head from 10 months ago, but ive got it all written down somewhere.
i think its something like this..

*scratches head*
Mech kit-just I/C, I/C piping, hoses,clamps, turbo, manifold dump pipe, front pipe with air filter and piece to attach your airflow meter to.
Stage 1-is the mechanical kit with the single injector and piggy back
Stage 2 -is the mechanical kit with the larger injectors bigger fuel pump, no bov or ecu.
Stage 3-is the mechanical kit with the larger injectors, bigger fuel pump ,bov, and link ecu
I'll have to check, but its something like that.
I only got the mech kit and did the rest myself to save money as well as the install, its basically a stage 3 with out the mark up.
Only problem is the install isnt straight forward, for a \"bolt on kit\" there was a lot of stuffing around, cutting, rebending, different hoses, wrong fittings..etc etc.. alot of annoying little bits, for the money you pay for AVO i thought it would have been easier. But they dont call it modifying for nothing!
But after all that im v.happy!