Romano have problems with the injectors in some cases. i'd want to talk to people who have it on their vy's first if I was you.
Have a look at Eurogas or Tartarini instead.
Muck more reliable and better running IMO.
I have had experiences with all three (and I am actually authorised and certified to fit all three) and by far the best system I deal with is the Tartarini.
It is much neater, the injectors are far more compact and reliable and the mapping of the ECU is damn near perfect.
Do your homework is all I can say. There are heaps of so called industry leaders having all sorts of problems with their systems at the moment and they are allways too bust for warranty work which means plenty of frustrated customers!!!!
Go have a look at this:
Global Autogas Supplies
Where are you?? If you are in melbourne I can give you some advice. Just PM Me.
I will be happy to help with advice on anything even if you do not want to go with me for you fitting ect.