Im looking to do this to my t25 probably a self install kit though.
I have an LPG'ed T25 (1987 2.1i Caravelle)
tbh, mixed results.
Its
not a multi-point injection system as I was told these engines aren't
new enough. That was some years ago (8yrs iirc). It doesn't do good fuel
economy tbh, only slightly better that petrol. Large loss of BHP under
gas.
The new gas system working on a 1.8T are excellent though, barely any different in performance.
As Lofty86 indicates, you can performance tune an LPG system on a turbo engine, but can lead to extra wear on piston rings, valves seats, etc iirc (it was a few years ago that I investigated it).
As a general note of using LPG itself, its well worth checkingn out avialabilty of LPG where you live before converting. Been in parts of the country where to use LPG would have meant any saving on MPG was cancelled out by distance to LPG fuel-station. Not mention the PITA of having to use naff commuter route to get to the fuel, rather than a nice quiet one.