Mate one of the leading garages specialising with the car has just said, politely, that he does not think is a good idea and has explained the difficulties in addressing the wear issues in the context of the zed. He's not said that its doomed to immediate failure though.
What more do you want?
I suspect you want someone to tell you that particular system is fine has none of the issues normally associated with lpg and will run great on your car over the long term saving you a fortune in fuel costs. You might have someone do that, but I suspect they will not have the knowledge of Mark.
Its a risk sum for you now. Do you want to play conservative on the basis of the view of an expert or take a chance and see if it works out.
For my amateur two p - I've seen a few people fit lpg to performance cars during my years on car forums. They seem to have engine problems eventually. Maybe its a coincidence.
Shinjuku
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