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I have just done a dual fuel on the Volvo wagon (V8). Its a good custom install with 'hi-po gear'. The gas tank is custom mounted between the floor pan and the under carriage, meaning I have not lost an inch of cargo space. (normally the tank must be mounted in the boot). So with a little extra expense you can retain 'some' of the boot space (hell its a tiny boot anyway).

The other advantage of gas not mentioned is the fact that it is 'fricken cold' and adds an intercooler like effect.

One other big advantage of a gas system is that it can be setup to cope with whatever fuel demmands you may have. This means you can retain the factory ecu and injectors etc when looking to slap a big ass turbo on.

The RB25DET motor is ideal for gas use, excellent combustion chambers and good flow,valves and seats. Ideally you would want a HKS cam gear for the exhaust to play with the cam timing.

IN WA you get a $500 cash back for converting to gas. On my Volvo my system had engineers permits for the special install and custom chassis bracing and other things and came to less than $2k after rebate. There are spare wheel shaped tanks available also.

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