well, bro to be honest, putting cng in and auto city ( or any other cvt ) is not usually recommended and many, many ppl have complained that the tranny dies after around 60,000kms on cng. but some of them also claim that if u change the transmission oil before its due ( 40,000kms), means u change it at around 30,000kms , then u ll be ok with cng. personally i know 2 ppl who have driven idsi cvt for 130,000kms without any problem with tranny on cng.but some ppl do get problems.
so, my suggesion wud be to keep it on petrol if u can but if its too rough on ur pocket, get it cnged but take good care of ur car.
as for the CNG kit details...
1) the best and well know cng kit in pakistan is Lendi renzo, its an italian company.there are other companies too, one of them is lovato, but lendi renzo efi kit seems to fit perfectly on idsi.
2) u ll have to get the following things.
a. A cylinder b.the actual kit c. advance d. emulator
new kits have a single unit which works for advancer and emulator both.
3) cant say about that bcuz i ve not from rwp.but heard there r sum good mechanics in commercial market.
4) The whole package will cost around 35-40k PKR, as prices keep on fluctuation.
my personal opinion wud be to calculate how much wud u save by putting in cng and will it cover the cost of kit or not in the period of time for which u plan to keep this car.i.e, if u plan to sell it in less then a year, dont get cng then.