Gas conversion on Nissan Skyline GTS

They can be converted successfully using a vapour-injection system, or better still, a more up-to-date liquid injection system. Both will deliver top performance, but the liquid-injection system will deliver the best performance. Finding a kit is a little difficult, the demand for them isn't high, so no one to my knowledge has taken the trouble to develop one, but the guys at the Australian LPG Warehouse (03 9770 2287) can develop a kit for you and it won't cost you any extra.