CNG kit on carborator engines gives very good result whereas its not as good as in the case of efi. but definitely there is a big difference of cost b/w petrol n CNG. do get installed CNG. u have choices. u can go to commercial market n over there is a cng pump behind cinema now shaadi hall. they are very good. than there is cng complex on double road but they r very expensive for nothing extra they offer. infact the commercial market one are the best. they give free fill of one cylinder as well. do install advancer n amulator in it.
and in islamabd u can go to al mubarik people they r the oldest n good in g-10. i got cng installed in my exclusive from them. any other info u want u can ask any momment
hey wik_a why did u not ask him for pics X-(