This is an excellent thread. Im right in the process of choose my LPG setup with my supercharger. Seeing Johns setup even though its a turbo and its GRA gives me hope that my setup can be achieved with the right tuner. Top work fellas.

I currently have lpg fitted but not working at the moment. The converter has been disconnected. It looks like I will need the following:

GRA mixer of some description (could be a S440)
2 B2 converters for optimum flow.
all the necessary parts and components to make it work.

Now the hard question, I want to be able to have the option of running petrol on the remote occasion I may need it. Could be a dozen times a year roughly, maybe less. Could I use a GRA dual fuel mixer, tune it to run on performance LPG and also tune it to run (not necessarily well) on petrol for getting me out of trouble on occasions???

I currently have a CAPA SCT flasher box so theoretically I could run more than 1 tune on it for each fuel type if needed, but would rather both fuels run on 1 fuel for convenience.

The above suggestion would work fine.
using the SCT Tuner i'd get a safe map for petrol, something that will let you use upto 3000rpm or similar.

then a ignition tune for LPG.

Rmyers car has GRA on a Powerdyne equipped I6 so worth looking at too.

Thanks mate. Thats sort of tune your suggesting sounds like what Im looking for. Im looking to get Graham West Workshops here in SA to fit the setup as they are the local suppliers of GRA setups.

I'll take a look at Rmyers setup. Im just happy Im not the only one who has looked into this.