Hello, I want to have my Grande Punto Racing 1.4 16V Bj 04/09 upgraded to LPG. I got offers from 2 dealers. Once a plant of Prins (evaporator system) for 1900€ ore Vialle (liquid injection) for 2450€ Another dealer offered me the Prin system for 250€, but inclusive car rental etc. What do you think of the systems? And are the liquid injection systems really better? I read that the diaphragm pumps are often defective… Weigh the advantages and disadvantages bitel (consumption, engine cooling, etc.) But I find the price difference already huge. Thank you for your opinions!!!