Another Dieselgas question (WA)

Hi all. I am going to get diesel gas put onto my 3.0 patrol here in Perth and as there a couple of different fitters here I had a question.

I have read some good things in regards to the system from Diesel Gas Australia, but there is also another mob here D-Gas. If I recall correctly from the conversations I have had with both one system injects before the turbo and one system injects after. Does this assumption sound correct and if so which is the better system.

There is a fair price difference between both of around $700. From what I have read it does seem worth investing in, but I would love to hear further from people who have had it done. I am looking at getting the conversion done sometime mid August. Would love to have a chat with anyone here in Perth who has had it donw and can advise the good (and bad - if any) points about the system. Should I do the exhaust at the same time and have aboost gauge fitted as recommended by one of the installers?

To anyone who comments on this post, thanks for you time.

Regards

Richard