Have Tucson 2.7 converted to gas

Hello I just added a Tucson 2,7 V6 ( year 2005 , 18000 km ) and would like to have this converted to LPG autogas I have already got some offers and the lie between 1999 to 3100 Euro ! What do you think for a plant for my car the best during – Prins , STAG 300 etc. ??? Who has a remodeled ? How great if I would get some tips on what I should pay attention to Greeting Flumbo