a plain turbo can be converted to Cng but an intercooler turbo takes air from the scoop and has oil in it to get rid of the dust particles.
i thnk pajero mini has an intercooler turbo thats why it moves on the road ... and CNG is totally out of the question,
but if CNG ports setup (like Liana) is used then it,s never gonan be an issue for any turbo setup car coz the gas is injected in manifold
and sadly such kits are not available in market yet