Liana it self is a good vehicle, regarding its CNG system Suzuki used landi reanzo SIS kits, which are not properly backed up by Landi, they r still trying to improve its performance as well as its injector rail noice, if they offer you modified 1, xj type or hd type injectors, then its ok I believe, but if its equiped with 3 ohms old coil type injectors,then there will be a terrible noice.