@taimoorkhan
bro i also got my car CNGed frm al-mubarik cng nd they r awesome.not a single problem hav occurred.but mine is manual.
the same al-mubarik guy told me that we hav done 3 city idsi auto and one steermatic converted to cng wid a special lambda oxygen system and they r all running excellent.the acceleration is almost 99% the same as petrol(thats what he told me i dnt know if he was lying or true).
he also told me that he hav done auto-citys to cng without lambda they r also running fine but fine means just FINE...not excellent.