I may be mistaken - but I believe it just goes down another $250 in June 2010 - to make the new rebate $1500. The rebate started a few years back at $2000 and is meant to go down $250 a year until it ceases. I've had two rebates myself - a $2000 one and more recently the $1750 (Discovery and P38)
As for what system, personally I went with a sequential gas injection system bought from UK and installed in Melb - see my other threads on the topicRPI engineering swears by a simple gas venturi system (mixer into air intake type), which is the system I had on my 3.9 discovery and it was faultless in the 3 years I ran it on gas - no backfires... The SGI systems are certainly fancier but real world I don't know that I'm any better off than having a venturi type /shrug Not sure that's any help but it seems either system can be successful on a P38 - the SGI system is more commonly recommended (except by RPI), especially for Thor engines like yours. One analogy I read compared the venturi system to essentially putting a carburettor onto your fuel injected vehicle.
Cost varies hugely I found with the quotes I got around Feb 2010 - from $3500 for venturi right up to $8000 for a SGI system - average was more like $5000-$5500 for most sgi installs though. So in Melb I'd expect around $3500 for venturi and around $5200 for sgi
Things to look out for - get the biggest LPG tank you can find/fit.... small tanks are a pita and personally I wouldn't look at a tank that goes in the cargo space, I'd much rather have a donut in the spare tyre well or cut the well out altogether and put a big manifold tank in there (= $$$) If you chose a venturi system then read the various threads on potential backfire issues and fit an RR classic air box.
I've had no personal experience with them but Melbourne Land Rover recommend and use LPG1 in Lilydale and Ritters apparently know their stuff when it comes to LPG also.



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RPI engineering swears by a simple gas venturi system (mixer into air intake type), which is the system I had on my 3.9 discovery and it was faultless in the 3 years I ran it on gas - no backfires... The SGI systems are certainly fancier but real world I don't know that I'm any better off than having a venturi type /shrug Not sure that's any help but it seems either system can be successful on a P38 - the SGI system is more commonly recommended (except by RPI), especially for Thor engines like yours. One analogy I read compared the venturi system to essentially putting a carburettor onto your fuel injected vehicle.

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