I have heard from many over here that CNG dosent work well with Vitz, Vario, and other automatic cars but I beg to differ I have witnessed many automatic cars on CNG including Vitz and Altas 1.8's which run very good on CNG which leads me to think that this all depends on the guy who instals your CNG kit. I persnoally prefer Butt sahib in Mozang Lahore.