older carbi cars from 1999-2007 were out performers for their efi varients...
i have yet to find a satisfied efi cultus owner , especially those who replaced their carby cultus for an efi variant.
A friend of mine bought a 2012 cultus in dec and is rather disappointing she wont go over 10km/litre..... despite her 5000 km maintenance, He cannot install a cng kit as it will void the warranty. Plus the steering wheel , acceleration , quality of material used is not satisfactory considering the price tag.
older carby varients , specially the vxli cng are good cars with balanced feul economy and performance. I thing you should opt for the carbi model.
prices for a good one would be starting from 550k to 750k in my opinion for a presting sind reg carbi cultus from 2005-2007.